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Runs in your browser · exact before/after size

Compress an image

Most compressors hide what they did to your photo. This one shows the original size, the new size and the resulting pixel dimensions before you download anything.

No uploadJPEG or WebPExact size shownNo watermark

Pick a photo, choose a size, see the real saving

JPG, PNG, WebP or HEIC that your browser can decode. Nothing leaves this page.

One image at a time
Original—
Compressed—
Change—
Dimensions—
Download compressed image

The percentage is measured from the actual encoded bytes, not estimated. Your original file is never modified.

How it works

  1. Your file is read locally and decoded by the browser — it is never sent anywhere.
  2. The image is redrawn on a canvas at your chosen maximum edge with high-quality smoothing, on a white background so transparent PNGs stay readable.
  3. The canvas is re-encoded as JPEG or WebP at the quality you pick, and the resulting blob is measured byte-for-byte.
  4. The download link points at that blob. Change any control and it re-encodes instantly.

What it will never do

  • It never claims a fixed “90% smaller” number — the saving depends entirely on your image, and the real figure is shown.
  • It cannot add detail back. Going down in pixels is permanent in the exported copy; your original file is untouched.
  • No upload, no queue, no account, no watermark.

Questions

Is my photo uploaded?

No. The file is decoded, resized and re-encoded by your own browser. You can put the device in airplane mode after the page loads and it still works.

JPEG or WebP — which should I pick?

WebP is usually 20–35% smaller at the same visual quality and is supported by every current browser and iOS. Pick JPEG when something must accept a .jpg specifically, such as an older upload form.

Why is my PNG bigger after compressing?

PNG stores flat graphics losslessly and can beat JPEG on screenshots or line art. When the result is larger, the page shows a “+” percentage — keep the original in that case.

Does it strip location data?

Re-encoding through a canvas drops EXIF, including GPS. That is a side effect, not a privacy guarantee — if a photo is sensitive, verify the exported copy before sharing it.

Scanning or sending documents from iPhone often?

ScanTo Pro: Offline PDF & OCR is optional — this free tool runs entirely in your browser and works without it. Check the app’s current App Store listing for exact features, pricing and availability before downloading.

View ScanTo Pro: Offline PDF & OCR on the App Store