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Image Compressor
Make image files smaller without sending them anywhere. Drop in one file or fifty, choose a quality level, and download the results — the whole thing runs on your own machine.
100% private — everything runs in your browser, nothing is ever uploaded.
What this tool does
A marketplace seller uploading twelve product photos hits a 20 MB form limit even though every picture looks perfectly ordinary on screen. Phone cameras write very large files by default, and upload forms reject bytes rather than pixels. This tool re-encodes JPG, PNG and WebP images at a quality level you choose, so a 6 MB photo becomes a 900 KB photo that looks the same to a customer scrolling a listing. It handles a whole folder in one pass, which matters when a batch of fifty shots has to go into a single listing or an email attachment. The quality slider is the only decision you have to make: around 70 to 80 percent is invisible on photographs, while flat graphics and screenshots usually tolerate much lower values. Nothing about the picture's dimensions changes; only the way its pixels are stored does.
How to use it in three steps
- Drag a folder's worth of images onto the drop area, or click it and pick several files at once. The list shows each file name and its starting size before anything is changed.
- Move the quality slider. Start near 75 percent for photographs and compare the preview with the original; go lower only when the smaller file is worth a visible difference.
- Press Compress, then download each result on its own or use Download all to collect the whole batch. Keep your originals in a separate folder so you can always start from a clean copy. Process one representative photo first and open it at full size before running the whole folder.
Questions people ask
Will my images come out smaller in physical dimensions?
No. Compression only changes how the existing pixels are encoded, so a 4000 by 3000 pixel image stays exactly that size. If a form asks for specific dimensions such as 800 by 800, use the image resizer instead, then compress the resized copy.
Why did one of my PNG files barely shrink?
PNGs of screenshots and line art are already stored efficiently, and re-encoding them as PNG saves almost nothing. Converting that file to WebP or JPEG through the image converter usually produces a far larger saving, because those formats were designed for continuous-tone images.
Can I compress the same file repeatedly without ruining it?
Repeatedly saving the same lossy copy compounds artifacts each time. Compress once from the original and keep the original untouched; that way the file you upload is a single re-encode, not ten stacked ones. There is no limit on how many different originals you process.
Can I compress a batch where some files are already small?
Yes. Each image is handled independently, so a file that is already well optimised may barely change while a large photo in the same batch shrinks considerably. The result list shows the real saving per file rather than a single average, which lets you spot the one that needs a different format.
Privacy: Every image is decoded, re-encoded and saved inside your browser tab; the file bytes are read from your disk and written back to your device, and no copy is ever sent to a server.
How to use it
- Drag your images onto the drop area, or click it to pick files. Multiple files at once are fine.
- Move the quality slider. 70–80% is usually invisible on photos; drop lower for smaller files.
- Press Compress, then download each result individually or press Download all.
Why it stays private
Re-encoding happens through the canvas element that is already built into your browser. Your bytes are read from disk, decoded, re-encoded and handed back to you — they are never placed on a network request. You can confirm this yourself in the Network panel of your browser's developer tools.
Questions
How much smaller will my files get?
It depends entirely on the image. Photographs saved as JPEG typically drop 40–80% at 70% quality with no visible difference. PNGs of screenshots and diagrams often shrink a lot when converted to WebP. An image that is already well optimised will barely change. And if what you actually need is several pictures bundled into one file, the JPG to PDF tool merges them into a single PDF.
Does compressing change the image dimensions?
No. This tool only re-encodes — every pixel stays where it was. If you need different dimensions, use the image resizer instead.
Is there a limit on file size or how many files?
There is no limit imposed by us, because nothing is sent to us. The practical ceiling is your own machine's memory, which in practice means files of a few hundred megabytes are fine.
Why is my photo too large to upload?
Almost every platform caps uploads: email clients near 20–25 MB, marketplace forms and CMS media libraries often far lower, and some profile forms reject anything over 1–2 MB. The failure is about bytes, not pixels — a phone photo can be physically huge while looking ordinary. Compressing to a quality around 70–80% usually brings a photo under any of these caps with no visible change, and the compressed copy is the one to upload.
Does compressing an image ruin quality?
Lossy compression discards detail the eye is worst at noticing, so at moderate settings the difference is genuinely invisible rather than merely tolerable. Damage appears when you stack compressions: saving a JPEG at 60% ten times compounds into visible smearing. Keep your original, compress a fresh copy each time, and you can compress as often as you like without degrading the source.