Add your JPEGs
Drag them in. Mixed folders are fine — PNG and WebP get handled too.
Compress JPEG images without uploading them
Most online compressors upload your photos to their servers. This one does not. Batch-compress up to 20 files free, locally.
Drop images here
or · JPG, PNG, WebP, GIF
How it works
Pick a quality level
Around 70–80 is the sweet spot for photos: usually 60–85% smaller with no visible difference. Go lower for thumbnails.
Download the ZIP
You get a per-file report showing exactly how many bytes each image lost.
Questions
Why not just use TinyPNG or similar?
Those services upload your images to their servers and process them there. That means your files sit on someone else's disk, and you hit upload limits. This tool processes everything inside the browser tab.
How much smaller will my files get?
Typical photos compress 60–85% at quality 75. Screenshots and graphics often reach 90%+. The exact number depends on the source image.
Can I compress PNG files too?
Yes. Choose WebP as the output format for the best results on PNG sources, or keep PNG lossless.
Is there a file size limit?
No artificial limit. Very large images (50 MP+) may be slow on older machines because everything runs on your own CPU.
What quality number actually means
The quality slider is the JPEG quantisation factor, not a percentage of "how good it looks". These are the empirically useful bands.
| Case | Value | Why it matters |
|---|---|---|
| 95–100 | Archive / print master | Roughly 2–4× smaller than the raw file. Indistinguishable at any zoom. |
| 85–92 | Web hero images | Safe default for large photos. No visible artefacts at 100% zoom on a retina display. |
| 70–82 | General web / product photos | 60–85% smaller. Slight softening visible only when zoomed. This is where most sites should live. |
| 55–68 | Thumbnails, previews, email | 80–90% smaller. Blocking appears in smooth gradients like skies. |
| 30–50 | Aggressive, form uploads | Only when a hard KB cap forces you. Visible artefacts, but readable. |
| Below 30 | Not useful for photos | Destroys detail. Crop or downscale the pixels instead. |
Five mistakes that waste the most time
Compressing an already-compressed file
Saving a JPEG at 75 that was already saved at 75 compounds the damage. Always compress from the original, once.
Compressing before resizing
Resizing down already removes most of the bytes. Compress second and you can often use quality 85 instead of 60 and still hit the same file size.
Ignoring dimensions
A 6000 px wide photo at quality 90 is still 4 MB. Halving the pixel dimensions cuts file size by 75% with almost no perceptual loss.
Judging quality at 50% zoom
Artefacts hide at reduced zoom. Always check at 100% before accepting.
Assuming WebP always wins
For flat graphics and screenshots, PNG or WebP beats JPEG badly. For noisy photographs, a high-quality JPEG is still competitive.
Free web version vs the $19 desktop app
| Free, this page | Bulk Image Kit $19 | |
|---|---|---|
| Batch limit | 20 images | Unlimited |
| Quality control | Slider 30–100 | Slider + per-image override |
| Output formats | JPEG, WebP, keep original | All of the above + PNG |
| Before/after report | Per file | Per file + batch totals |
| Runs offline | After first page load | Always |
More questions
Why is my compressed file sometimes bigger?
Re-encoding a file that was already aggressively compressed can increase size, because the encoder rewrites tables your source had stripped. It also happens if you output PNG from a source that was a small JPEG — PNG cannot compress photographic noise.
Does JPEG compression remove metadata?
Yes. The re-encode drops EXIF, including GPS coordinates and camera model. For sharing photos publicly that is usually a privacy win.
Can I compress to an exact target size?
Not with a single pass. Set a low quality, check the reported output size, then adjust and re-run. Two or three passes gets you under almost any cap.
Is progressive JPEG supported?
The browser encoder writes baseline JPEG. Progressive is marginally smaller for large images but is not exposed by the canvas API.
Need more than 20 at a time?
Bulk Image Kit is the same engine as a single offline file — unlimited images, resize + compress + watermark + rename, one-time $19, no subscription.
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- All-in-one bulk image tool