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Image Editor

Compress an image

Drag the quality slider and watch the output size update live. Save when you are happy with the trade.

  • Free, no signup
  • No upload — runs on your device
  • No watermark
  • Unlimited use

Compress Image

Processed locally
Drop an image here

JPG, PNG, WebP, AVIF

Quality 80 is not 80% of the quality

JPEG quality settings are not a percentage of anything. The number selects a quantisation table — a grid of divisors applied to the frequency coefficients of each 8×8 pixel block. Between 100 and 90 the table barely changes and the file halves. Between 90 and 75 it changes a little more and the file halves again. Below 50 the divisors get large enough that the block structure itself becomes visible.

The practical consequence is that the curve is extremely lopsided. Going from 100 to 85 typically removes 60–70% of the bytes while being genuinely invisible on a photograph. Going from 85 to 70 removes another 25% and starts showing on flat gradients — skies, skin, studio backdrops. Going below 60 is only defensible for thumbnails.

WebP at the same nominal quality is usually 25–35% smaller than JPEG, and unlike JPEG it supports transparency. If your audience is on any browser released after 2020, there is no reason to ship JPEG.

How it works

  1. Drop in an image
  2. Move the quality slider and watch the live size estimate
  3. Click Compress to download at that setting
Why nothing uploads. Every operation on this page happens inside your browser using JavaScript and WebAssembly. Your file is read into memory, processed, and offered back as a download. It is never transmitted. Disconnect from the internet after this page loads and the tool keeps working.

Frequently asked questions

What quality setting should I use for photos on a website?
Between 75 and 85. That range is visually indistinguishable from the original for most photographs while removing the majority of the file size. Check gradients — skies and skin — before going lower.
Why is WebP smaller than JPEG at the same quality?
WebP uses a more efficient prediction and entropy coding scheme. At equivalent visual quality it is typically 25–35% smaller, and it also supports transparency, which JPEG does not.
Does compressing a PNG reduce its size?
Converting a PNG to JPEG or WebP will. Recompressing a PNG as a PNG will not, because PNG is lossless — the pixels are already stored as compactly as the format allows.
Will compression remove my image metadata?
Yes. Redrawing the image through canvas discards EXIF, including GPS coordinates. If that is your goal specifically, use the Remove Image Metadata tool, which does it without touching quality.
Can I compress the same image twice?
You can, but you should not. Each JPEG pass quantises already-quantised data, compounding artefacts. Always compress from the original.

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