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Upload an animated GIF, then adjust dimensions and click Resize GIF to preview here.

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GIF resizer online free — resize animated GIFs, change GIF dimensions & scale

Free GIF resizer: resize GIF, change GIF dimensions, and downsize animated GIFs online. Adjust width and height in pixels with aspect ratio lock.

What is a GIF Resizer?

A GIF resizer is an online tool that changes the pixel dimensions of animated GIF images while preserving all frames, animation timing, and looping. Unlike static image resizers that only handle single-frame images, this tool parses the complete GIF structure — extracting every frame with its delay timing — scales each frame individually using high-quality canvas interpolation, and reconstructs a fully animated GIF at the new size. This free online GIF resizer runs entirely in your browser: upload an animated GIF, enter your desired width and height in pixels, optionally constrain the aspect ratio to avoid distortion, and download a resized animated GIF. Perfect for resizing GIFs for Discord emojis and stickers, social media posts, email attachments, and website optimization.

GIF Resizer Features

Resize animated GIFs online with full control over dimensions.

  • Custom Width & Height

    Set exact pixel dimensions for your resized GIF from 1 to 9999 pixels. Enter any width and height combination you need.

  • Aspect Ratio Lock

    Enable constrain proportions to maintain the original GIF aspect ratio. The tool fits your GIF within the requested dimensions without stretching or distortion.

  • Free Stretch Mode

    Disable constrain proportions to set width and height independently. Stretch or squeeze GIFs to any custom aspect ratio.

  • Animation Preserved

    Every frame is scaled individually. The animation speed, frame delays, and looping are all preserved in the resized GIF.

  • Client-Side Processing

    GIF parsing, per-frame scaling, and GIF re-encoding happen entirely in your browser. No server uploads.

How to Resize an Animated GIF

Three simple steps to resize your GIF online.

  1. 1. Upload Your GIF

    Drag and drop an animated GIF file into the upload area, or click to browse from your device.

  2. 2. Enter New Dimensions

    Type your desired width and height in pixels. Enable constrain proportions to maintain the aspect ratio and avoid stretching.

  3. 3. Resize & Download

    Click Resize GIF to scale every frame to the new dimensions. Preview the resized animation and download your GIF.

Tips for Resizing GIFs

Best practices for getting the best resized GIF results.
  • 01

    Use Constrain Proportions for Quality

    Keep constrain proportions enabled when you want a clean, undistorted resize. The tool scales to fit within your dimensions while maintaining the original shape.

  • 02

    Check Common Platform Sizes

    Discord emotes need 128×128, stickers 320×320. Twitter GIFs display at up to 1280×720. Use these targets for the best social media results.

  • 03

    Downsize for Faster Loading

    If loading speed matters, reduce GIF dimensions. A 320×240 GIF loads significantly faster than a 1280×720 GIF with the same number of frames.

  • 04

    Preview Before Downloading

    Review the resized GIF in the preview area to check for any unexpected stretching, pixelation, or quality issues before saving.

GIF Resizer Tools Compared — Which One Fits Your Workflow

How this free GIF resizer stacks up against other popular online tools.

  1. Ezgif.com

    The most popular GIF resizer with pixel, percentage, and preset size options. Requires server upload. Supports batch resizing.

  2. Iloveimg.com

    Bulk image resizer that also handles GIFs. Offers percentage and pixel resizing. Files uploaded to their server for processing.

  3. Clideo.com

    GIF resizing with dimension controls and aspect ratio lock. Needs internet connection for processing. Free tier has limitations.

  4. GIF Resizer

    Resize animated GIFs online with custom pixel dimensions. Aspect ratio lock for distortion-free scaling. All processing in your browser with no upload.

Perfect for These Uses

Common scenarios for resizing animated GIFs.

  1. Discord Emotes & Stickers: Resize GIFs to 128×128 for Discord emotes or 320×320 for Discord stickers. No annoying file size restrictions, but you still have to keep uploads within Discord limits.

  2. Social Media Posts: Resize GIFs to optimal dimensions for Twitter (max 5 MB on mobile), Instagram stories, or messaging apps. Smaller GIFs load faster and share more easily.

  3. Email Attachments: Downsize large GIFs to smaller dimensions for email attachments. Most email clients have file size limits, and smaller GIFs are more likely to display correctly.

  4. Website Optimization: Scale GIFs down to exact display dimensions for web pages. Avoid loading oversized GIFs and using CSS to scale them — resize to the actual display size for faster page loads.

Why Use This GIF Resizer

Advantages of resizing GIFs with this free online tool.

  • No Software Required

    Works entirely in your browser. No Photoshop, no video editors, no apps to install.

  • Animation Preserved

    Unlike static image resizers, this tool preserves every frame, timing, and loop of your animated GIF.

  • Complete Privacy

    Your GIF files stay on your device. All processing runs locally in JavaScript.

  • 100% Free

    No sign-ups, no watermarks, no limits. Resize as many GIFs as you need.

Technical Details

How the GIF resizer works under the hood.
GIF Frame Parsing
The tool parses the raw GIF binary format extracting every frame's LZW-compressed pixel data, dimensions, and delay timing.
Per-Frame Canvas Scaling
Each frame is drawn to a full-size canvas and scaled to the target dimensions using Canvas 2D drawImage with smoothing and bicubic interpolation for high-quality results.
Aspect Ratio Control
When constrain proportions is enabled, the tool computes the scale ratio from both dimensions and uses the smaller ratio. This fits the GIF inside the requested box without cropping or distortion.
Client-Side Processing
All parsing, scaling, and GIF encoding runs entirely in JavaScript in your browser. No server processing.
Supported Input
Animated GIF files up to 15 MB. Supports both GIF87a and GIF89a formats with looping, transparency, and interlace.
Output Format
Output is a standard GIF89a file with looping enabled, matching the original frame delays and preserving transparency where possible.

Sources & References

Authoritative references on GIF format, image scaling, and browser-based animation processing.
  • “The Graphics Interchange Format is a bitmap image format that supports animations.”
    — Wikipedia — GIF

    GIF — Graphics Interchange Format: GIF is a widely supported animated image format. This tool scales GIF frames while preserving animation timing and looping. en.wikipedia.org/wiki/GIF

  • “The Canvas API provides a means for drawing graphics via JavaScript and the HTML canvas element.”
    — MDN Web Docs — Canvas API

    Canvas API (client-side rendering): This tool uses the Canvas 2D API with smooth scaling to resize each GIF frame — entirely in your browser. developer.mozilla.org/en-US/docs/Web/API/Canvas_API

  • “Image scaling is the process of resizing a digital image. The Canvas API provides high-quality bicubic interpolation for smooth scaling.”
    — Wikipedia — Image scaling

    Image scaling: Each GIF frame is individually scaled using canvas drawImage with smoothing, producing clean resized frames without pixelation. en.wikipedia.org/wiki/Image_scaling

  • “LZW is a universal lossless data compression algorithm used in the GIF format and other file formats.”
    — Wikipedia — Lempel–Ziv–Welch

    LZW Compression: After resizing frames, the tool re-encodes them using LZW compression to produce a valid GIF89a file with all animation preserved. en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Welch

Frequently Asked Questions

Quick answers about this tool—open a question to read more.