About this tool
What is the Image Compressor?
The ReelStack Image Compressor shrinks JPG, PNG, WebP, and AVIF images right in your browser using the Canvas API and built-in encoders. Nothing is uploaded — the entire compression pipeline runs on your device, which means it works offline, costs nothing, and your photos never touch our servers.
Use it for shaving megabytes off product photos before uploading to a marketplace, optimizing AI-generated stills before embedding them in a video edit, or hitting hard file-size caps on platforms like Discord, Twitter, and WhatsApp. Set a target quality, max file size, or output format — including AVIF for the best compression ratio modern browsers support.
For filmmakers shipping reels: WebP at 80% quality typically cuts a 4K still by 70-85% with no visible loss. AVIF goes further (~90%) but takes longer to encode and is unsupported in older clients.
FAQ · IMAGE COMPRESSOR
Questions about the Image Compressor
Is the Image Compressor really free?
Yes. It's 100% free, no signup, no watermark, no file count limit. The whole tool runs in your browser — there's no server cost on our side, so there's no paywall.
Does it upload my images?
No. Compression happens entirely on your device using the browser's Canvas API. Your images never leave your computer. We can't see them, save them, or train on them.
What file formats are supported?
Input: JPG, PNG, WebP, AVIF, HEIC, BMP. Output: JPG, PNG, WebP, AVIF. WebP gives the best ratio on modern browsers (Chrome, Firefox, Edge, Safari 14+). AVIF compresses harder but takes longer to encode.
How do I hit a specific file size?
Switch to 'target file size' mode and enter a number (e.g. 500 KB). The tool binary-searches the quality slider to land within ~5% of your target. For batch jobs, it applies the same quality to every image.
Can I compress images in bulk?
Yes — drop multiple files at once or paste a folder. Each runs in parallel up to your CPU's worker count, and you can download them as a ZIP when done.