OpusClip is the pick for resizing a long recording into vertical clips that keep the speaker in frame, with AI Reframe cropping each clip to 9:16 as it is cut. For a finished video, Clipchamp and CapCut are the picks for free exports without a watermark, Flixier for resizing in the browser, Kapwing for saved custom ratios, VEED for AI-filled backgrounds, Clideo for exact pixel sizes and Canva for resizing inside a design. The guide is organised around resizing for TikTok, Reels and Shorts: OpusClip comes first as the tool built for it, and items 2 to 8 follow what a free account gets, read November 9, 2026.

Key takeaways

• Best for resizing a long recording into vertical clips: OpusClip. Its help center says Auto Reframe tracks moving and active speakers, and its clip layout settings offer 9:16, 1:1 and 16:9.
• Best for a free resize with no watermark: Clipchamp. Its pricing page lists watermark-free exports up to 1080p on the Free plan, with resize and crop included.
• Best for fitting a video to a new canvas with a color, blur or image: CapCut. Its resizer page lists those fills, six preset ratios and output from 720p to 4K.
• Best for resizing without uploading the file: Flixier. Its resizer page says resizing happens in the browser on the user's device and needs no account.
• Best for saved custom ratios: Kapwing. Its resize page says custom ratios can be saved to a workspace; free exports carry a watermark and stop at 720p.
• Best for filling empty space with AI instead of black bars: VEED. Its AI Background Expand page describes extending the frame for clips up to 1 minute.
• Best for exact pixel sizes: Clideo. Its page lets users enter a width and height; free uploads stop at 500 MB and exports carry a watermark.
• Best for resizing inside a design: Canva. Its Magic Switch resize is limited to Canva Pro, per its video resizer page.

How to choose

• A long recording or interview that should become vertical clips: OpusClip, which resizes each clip as it cuts it.
• A finished video that needs a different shape: Clipchamp, CapCut, Flixier, Kapwing, VEED, Clideo or Canva, each of which takes a file and changes its canvas.
• No watermark on a free export: Clipchamp says so on its pricing page and CapCut says so on its resizer page; OpusClip's Free plan, Kapwing, VEED, Clideo and Flixier's editor plan list a watermark, and Canva's resize needs Pro.
• The speaker kept in frame automatically: OpusClip, Kapwing's Speaker Focus or CapCut's desktop Auto reframe; the other tools crop or fit by hand. Our guide to the best auto reframe tools compares AI subject tracking in depth.
• Resizing from code: our guide to auto-resizing video with the OpusClip API covers that case.
• Editing on a phone: our guide to AI video editing apps for mobile compares phone apps.

What size do TikTok, Reels and Shorts need?

The platforms publish ranges and limits rather than one size, and the sources differ in how much they say. These are the figures from each platform's own pages, read on November 9, 2026.

• YouTube Shorts: YouTube's upload help says to select a short-video file of up to 3 minutes with a square or vertical aspect ratio.
• Instagram Reels: Instagram's Help Center says a reel can have an aspect ratio between 1.91:1 and 9:16, with a minimum frame rate of 30 FPS and a minimum resolution of 720 pixels.
• TikTok: TikTok publishes its video specs for ads on ads.tiktok.com, which returned a 403 error to our script, so this guide prints no size taken from TikTok itself. VEED's resizer page lists TikTok at 9:16, and OpusClip's TikTok resizer page uses 9:16 as the TikTok-friendly dimension.
• YouTube long-form: YouTube's help says the standard aspect ratio on a computer is 16:9, and advises against adding padding or black bars directly to a video.

A 9:16 vertical export sits inside the Shorts and Reels ranges above. How a tool gets a video to 9:16 matters more than the number, and the tools here use four methods.

• Crop to fill: cut away the edges of the frame so the picture fills the new ratio. OpusClip's Fill layout, Clipchamp's fill button and Flixier's crop handles work this way.
• Fit with a background: keep the whole frame and fill the leftover canvas with a color, a blur or an image. CapCut, Clipchamp and Clideo list this.
• Reframe to follow the subject: move the crop as the speaker moves. OpusClip, Kapwing's Speaker Focus and CapCut's desktop Auto reframe describe it.
• Extend the background: generate new pixels to widen the frame. VEED's AI Background Expand describes this.

At a glance

• OpusClip: best for resizing a long recording into vertical clips; per its pricing page, Starter is $15 a month billed monthly and Pro is $29 a month or $14.50 a month billed annually; free plan yes (watermark).
• Clipchamp: best for a free resize with no watermark; Premium comes with Microsoft 365 Personal and Family, and Clipchamp's pricing page prints no separate price; free plan yes (watermark-free, up to 1080p).
• CapCut: best for fitting a video to a new canvas with a color, blur or image; per its pricing page, Pro is USD 19.99 a month or USD 179.99 a year, and the page says displayed pricing is for reference only; free plan yes.
• Flixier: best for resizing in the browser without an upload; per its pricing page, Starter is $19 per seat a month on monthly billing; free plan yes (Flixier watermark and 720p on editor exports).
• Kapwing: best for saved custom ratios; per its pricing page, Pro is $24 a month billed monthly or $16 a month billed annually; free plan yes (watermark, 720p, exports up to 4 minutes).
• VEED: best for filling empty space with AI; per its pricing page, Creator is $12 per user per month billed yearly; free plan yes (720p and a watermark, per its help center).
• Clideo: best for exact pixel sizes; per its pricing page, Pro is $9 a month billed yearly ($108 a year); free plan yes (watermark, up to 720p, 500 MB uploads).
• Canva: best for resizing inside a design; per its pricing page, Pro is US$144 a year for one person; free plan yes, but Magic Switch resizing is Pro only.

Sizes, fit method, where it runs and free export terms

The At a glance list covers best-for, price and whether a free plan exists; this table compares the sizes each tool lists, how it fits the frame, where it runs and what its free export gives up, as listed on each vendor's own pages on November 9, 2026.

1. OpusClip: Best for resizing a long recording into vertical clips that keep the speaker in frame

OpusClip's clip layout settings. Source: OpusClip help center

OpusClip cuts a long video into short clips, and AI Reframe is the step that resizes each clip. Its help center says Auto Reframe tracks moving and active speakers on screen, its Fill and Fit layouts either crop to the speaker or keep more of the original frame, and a crop window allows manual changes. The AI Reframe page describes the feature, and OpusClip's TikTok resizer and aspect ratio changer pages describe the same upload-and-resize flow.

When the job is only resizing, the help center describes a Don't Clip option that submits a whole video without automatic clips and returns a caption-only project, and it lists a length restriction on that setting. Its clip layout settings offer 9:16, 1:1 and 16:9 aspect ratios. The help center says OpusClip does not compress videos to a lower resolution but does crop them: a 4K source (3840 x 2160) cropped to 9:16 comes out at 1215 x 2160, and where either side is below 1080 it upsamples to 1080 x 1920.

Pricing: OpusClip's pricing page lists Free at $0 (a watermark, rendered clips up to 1080p, and clips that stop being exportable after 3 days), Starter at $15 a month billed monthly, and Pro at $29 a month or $14.50 a month billed annually, with Business custom. Each plan lists a monthly credit allowance; see the pricing page for the amounts.

Considerations: OpusClip is a clipper first and not a canvas resizer: it takes a link or an upload and returns clips or a captioned project, and the Free plan adds a watermark. Its iOS help article says some features are only on the web version, so the phone apps are lighter than the browser.

• Choose it if the job is a long video, podcast or interview that should become vertical clips with the speaker kept in frame.
• Skip it if the job is resizing one finished video to an exact size with a free export and no watermark; Clipchamp or CapCut fit that better.

2. Clipchamp: Best for a free resize with no watermark and fit, fill and blur options

Clipchamp's Fill and Fit options. Source: Clipchamp website

Clipchamp's resizer page lists aspect ratio presets of 16:9, 9:16, 1:1, 4:3, 4:5, 2:3 and 21:9, a freehand crop tool, fit and fill buttons, and a blur fill effect that replaces black bars, with color and gradient backgrounds as another fill. Its pricing page lists "Trim, crop, resize, and rotate assets" and watermark-free exports as included on the Free plan, with export up to 1080p; 4K export and the brand kit come with Microsoft 365 Personal or Family.

The Free plan needs a sign-in with a personal Microsoft account and no download, per the pricing page.

Pricing: Clipchamp's pricing page lists a Free plan and says Premium features come with Microsoft 365 Personal and Family plans; it prints no separate price, so see Microsoft's page for the Microsoft 365 price.

Considerations: Resizing is manual: presets, fit or fill, and a freehand crop tool. The resizer page does not describe subject tracking, and free exports top out at 1080p.

• Choose it if a watermark-free export up to 1080p matters and signing in with a Microsoft account is fine.
• Skip it if the framing should follow a speaker automatically, or the export needs to be 4K without a Microsoft 365 plan.

3. CapCut: Best for fitting a video to a new canvas with a color, blur or image background

CapCut's Aspect ratio panel. Source: CapCut website

CapCut's resizer page lists preset canvases of 1:1, 2:1, 3:4, 4:3, 9:16 and 16:9, says unused space can be filled with a color, a blurred background or an image, and lists output resolutions of 720p, 1080p, 2K and 4K. The page also says the tool adds no watermark. A separate Auto Reframe page describes a desktop feature with an aspect ratio picker plus Image stabilization and Camera moving speed settings, and notes that it is available in specific regions.

CapCut runs online, on desktop and on mobile; the resizer page says the mobile app resizes through its Canvas tool.

Pricing: CapCut's pricing page lists Free with templates and basic editing tools and Pro at USD 19.99 a month or USD 179.99 a year, and says displayed pricing is for reference only.

Considerations: The resizer page does not say which output resolutions need a paid plan, and Auto Reframe depends on region.

• Choose it if a video should keep its whole frame inside a new ratio with a color, blur or image behind it, on a phone, desktop or browser.
• Skip it if automatic subject tracking is needed everywhere, since Auto Reframe is listed for specific regions only.

4. Flixier: Best for resizing in the browser without uploading the file

Flixier's free resizer page. Source: Flixier website

Flixier's free resizer accepts MP4, MKV, WebM and MOV files and offers 1:1, 9:16, 16:9 and 4:5 or freehand crop handles. Its page says resizing happens locally in the browser, so the file is never sent to a server, and that no account or install is needed. Once a video is resized, the page says it can be opened in the full Flixier editor.

Pricing: Flixier's pricing page lists a Free plan with 10 minutes of video export a month, 720p and a Flixier watermark, and Starter at $19 per seat a month on monthly billing, with 1080p and no watermark. The resizer page does not say whether the standalone tool adds a watermark, so check the output before relying on it.

Considerations: Resizing is manual: a ratio or crop handles. The page lists no background fill and no subject tracking.

• Choose it if a private file should stay on the device and a quick change to square, vertical, widescreen or portrait is all that is needed.
• Skip it if the video needs a fitted background or the framing should follow a speaker.

5. Kapwing: Best for saving custom ratios and following a resize with team editing

Kapwing's editor canvas sizes. Source: Kapwing website

Kapwing's resize page says it stores presets for TikTok, Instagram and YouTube, lets users save their own aspect ratios to a workspace, and suggests duplicating a project and resizing each copy for a platform. Its Speaker Focus tool is described as detecting and centering talking heads and runs in the browser. The editor, opened on November 9, 2026, starts on a blank canvas that offers 21:9, 16:9, 1:1, 4:5 and 9:16.

Pricing: Kapwing's pricing page lists Free at $0 with unlimited exports that carry a watermark, exports up to 4 minutes long and 720p, and Pro at $24 a month billed monthly or $16 a month billed annually, which removes the Kapwing watermark and adds 4K and exports up to 2 hours.

Considerations: The 4-minute export cap on Free rules out long recordings, and every free export carries a watermark.

• Choose it if ratios should be saved for a team, or a resize should flow straight into subtitles and other editing.
• Skip it if a long video needs a free export, or the resize should be one click with no editor.

6. VEED: Best for filling empty space with AI instead of black bars

VEED's size presets menu. Source: VEED website

VEED's resizer page lists presets for YouTube (16:9), Instagram Story (9:16), TikTok (9:16), Facebook Cover, LinkedIn and square (1:1), and says to drag to crop or use Fit to Canvas. A separate AI Background Expand page describes AI outpainting that extends the frame instead of leaving bars, and says it supports videos up to 1 minute in length. VEED's help center says the web, Android and iOS apps share the same export steps.

Pricing: VEED's pricing page lists Creator at $12 per user per month billed yearly. Its help center says free exports are 720p only and carry a VEED.IO watermark, and that a paid subscription is the only way to export without it.

Considerations: AI Background Expand is capped at 1 minute per its page, and the page does not name the plan that includes it.

• Choose it if a clip under a minute needs its background extended to a new ratio and a bar-free result is worth a paid plan.
• Skip it if a free export without a watermark is needed, or the video runs longer than a minute.

7. Clideo: Best for a quick one-off resize to exact pixel dimensions

Clideo's size dropdown and background colors. Source: Clideo website

Clideo's resizer lists presets for Instagram, Facebook, YouTube, Snapchat, Twitter, Pinterest and LinkedIn post and ad types, lets users enter an exact width and height, and offers to fit the whole video into the frame with a background color or blur, or to fill the frame. Files can come from a computer, a phone or a cloud storage account, per the page.

Pricing: Clideo's pricing page lists Free with an export watermark, up to 720p and a 500 MB upload limit, and Pro at $9 a month billed yearly ($108 a year) with no watermark and 4K.

Considerations: Free uploads stop at 500 MB, which rules out long recordings, and the page lists no subject tracking.

• Choose it if one file needs an exact width and height, or a blurred or colored background, without setting up an editor.
• Skip it if the export must be watermark-free and above 720p on a free plan.

8. Canva: Best for resizing a video inside a branded design

Canva's Resize panel. Source: Canva website

Canva's video resizer page lists preset sizes for TikTok, Instagram and Reels and custom dimensions, and says its premium Magic Switch tool makes a video fit any aspect ratio, with a crop tool to frame the result. The page says Magic Switch is only available to Canva Pro users, lists MP4, MOV, MKV, MPEG and WEBM uploads, and says the video can be downloaded as an MP4 without a watermark.

Pricing: Canva's pricing page lists Free at US$0 and Pro at US$144 a year for one person, with AI tools that include resize.

Considerations: The resize needs Pro, which is why Canva comes last on the free-account yardstick, and Canva is a design editor rather than a clipping tool.

• Choose it if the video sits inside a Canva design with brand colors and a Pro plan is already paid for.
• Skip it if a free resize is needed, or a long recording should become clips.

How we compared these tools

We compared each tool on five points: the sizes it lists, how it fits the frame (crop, fit with a background, reframe to follow a subject, or extend the background), where it runs, what a free export gives up (a watermark, a resolution cap, a length or file-size cap) and the price with its billing basis. The guide is organised around resizing a video for TikTok, Reels and Shorts, and OpusClip comes first because AI Reframe is built for that job, resizing each clip it cuts from a long video. It is a clipper rather than a general resizer, though: its Free plan adds a watermark, so Clipchamp and CapCut remain the picks for a free, watermark-free resize of a finished file.

Items 2 to 8 follow one yardstick, what a free account gets from a resize. Clipchamp lists watermark-free exports up to 1080p on its Free plan, and CapCut's resizer page says it adds no watermark. Flixier's resizer needs no account, though its editor plan lists a watermark. Kapwing, VEED and Clideo tie on free terms, a watermark and 720p, and follow in order of how many fit options each vendor lists. Canva is last because its resize is limited to Pro. Positions 5 to 7 are close calls, not a scored formula.

All facts come from each vendor's own pricing page, help center and site, plus YouTube's and Instagram's help pages, read on November 9, 2026, and every price is stated with the billing basis the page shows. We did not run hands-on tests of any tool. Adobe Express's pages return a 403 error to scripts, so it is not in this list, and TikTok's ad specs page did the same. Descript, Runway and Adobe Premiere appear in our guide to the best auto reframe tools, which covers AI subject tracking, so this list stays on resizing.

Red flags to watch for

• Watermarks on free exports. OpusClip's Free plan, Kapwing, VEED, Clideo and Flixier's Free editor plan list one; Clipchamp's pricing page and CapCut's resizer page say theirs add none.
• Resolution caps on a free plan. Kapwing, VEED, Clideo and Flixier's Free editor plan list 720p, and Clipchamp and OpusClip list up to 1080p.
• Length and size caps. Kapwing's Free plan stops at 4-minute exports, Clideo's at a 500 MB upload, Flixier's Free editor plan at 10 minutes of export a month, and OpusClip's Free clips stop being exportable after 3 days.
• A resize behind a paid plan. Canva's resize needs Pro.
• Black bars baked into the file. YouTube's help advises against adding padding or black bars directly to a video, so a fit with a bar-free background suits uploads better than bars.
• Cropped-out subjects. A plain crop cuts the edges of the frame, and only OpusClip, Kapwing's Speaker Focus and CapCut's desktop Auto reframe describe following the subject.
• Region and length gates on AI features. CapCut lists Auto Reframe for specific regions and VEED's AI Background Expand lists a 1-minute cap.
• Prices shown for reference. CapCut's pricing page says displayed pricing is for reference only, so the final price can differ.
• No manual override. An AI reframe without a manual crop leaves no fix for a shot where the subject is cut off; OpusClip's help center lists a crop window for that.

Frequently asked questions

What is the best video resizer for TikTok?

It depends on the job. For turning a long recording into vertical clips with the speaker kept in frame, OpusClip comes first in this guide, and its TikTok resizer page describes an upload, a 9:16 resize and posting to TikTok. For a finished video, Clipchamp and CapCut are the picks for free exports without a watermark, Flixier for resizing in the browser, Kapwing for saved custom ratios, VEED for AI-filled backgrounds, Clideo for exact pixel sizes and Canva for resizing inside a design.

What is a video aspect ratio changer, and how is it different from cropping?

An aspect ratio changer reshapes a video into a new ratio such as 9:16, 1:1 or 16:9. Cropping is one way to do it and cuts away the edges of the frame. The other ways keep the whole frame and fill the leftover canvas with a color, blur or image, follow the subject as it moves, or generate new background pixels. The sections above list which tool uses which method.

How do I resize a video for TikTok, Reels and Shorts?

Upload the video, choose 9:16, pick crop, fit or reframe, check that the subject is still in frame and export. A 9:16 file sits inside YouTube's square-or-vertical rule for Shorts and Instagram's 1.91:1 to 9:16 range for reels. OpusClip's aspect ratio changer page walks through that flow for clips, and the other seven tools in this guide change the canvas of a finished file.

What size should a video be for Instagram Reels?

Instagram's Help Center says a reel can have an aspect ratio between 1.91:1 and 9:16, with a minimum frame rate of 30 FPS and a minimum resolution of 720 pixels, as read on November 9, 2026. A vertical 9:16 export fills the screen, and most tools in this guide name 9:16 as a preset or option.

What size should a YouTube Short be?

YouTube's upload help says a Short is a file of up to 3 minutes with a square or vertical aspect ratio. YouTube's help for long-form video says the standard aspect ratio on a computer is 16:9 and advises against adding padding or black bars directly to the video.

Is there a free video resizer with no watermark?

Two vendors say so. Clipchamp's pricing page lists watermark-free exports up to 1080p on its Free plan, and CapCut's resizer page says its tool processes videos without adding watermarks. Flixier's resizer needs no account, but its pricing page lists a watermark on Free editor exports. OpusClip's Free plan, Kapwing, VEED and Clideo list a watermark, and Canva's resize needs Pro.

Does resizing a video lower its quality?

Cropping to a narrower ratio removes pixels, so the output is smaller than the source. OpusClip's help center says it does not compress videos to a lower resolution but does crop them, with a 4K source cropped to 9:16 coming out at 1215 x 2160. Flixier's page says resizing changes the frame dimensions and not the compression level, and VEED's page says resizing the canvas does not lose quality; both are vendor statements we did not measure.

Can a resizer keep the speaker in frame automatically?

Three tools here describe it. OpusClip's help center says Auto Reframe tracks moving and active speakers, Kapwing's Speaker Focus page says it detects and centers talking heads, and CapCut lists an Auto Reframe feature on desktop in specific regions. The other tools crop or fit by hand. Our guide to the best auto reframe tools compares subject tracking in depth.