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IMG / 01 · exact-size compression

Compress image to exact size

Name a limit in KB or MB. Get the best-looking file that fits under it. Nothing leaves your device.

toolzool / image-tools / compress-image

Target 50 KB

Zooly is still building this one. The interface below is the real thing, switched off until the compression engine ships. Nothing here will accept a file yet — we would rather show you what is coming than fake a progress bar. Read how it will work.

  1. 1 Choose
  2. 2 Compress
  3. 3 Download

No upload · processed on device · metadata stripped

How to compress an image to an exact size

  1. 01

    Choose your image

    Drop a file on the tool or press the button to pick one. Because nothing uploads, a large file costs you no waiting — a 40 MB camera JPEG starts processing as fast as a screenshot.

  2. 02

    Set the target

    Pick a preset or type an exact number in KB or MB. This is a ceiling, not a goal: the result will be at or under it, never over.

  3. 03

    Let the search run

    The tool encodes at several quality levels and narrows in on the highest one that still fits, rather than encoding once at a guessed setting. On Auto, dimensions are only reduced if no quality level can reach the target.

  4. 04

    Check and download

    You see the original size, the new size and the reduction as a percentage, with a preview to judge the result. Aspect ratio is preserved and camera metadata is dropped.

Privacy

Your image is decoded, compressed and re-encoded inside this browser tab. It is never sent to ToolZool or to anyone else, there is no upload queue, and nothing is stored — which is also why we cannot see what you processed.

  • No upload — there is no endpoint to send a file to
  • Nothing stored, so there is nothing for us to delete or leak
  • Camera, timestamp and GPS metadata are dropped by re-encoding
  • Works offline once the page has been visited

Read the full privacy policy

Supported formats

Accepts

JPGPNGWebPAVIF

Produces

JPEGWebP

Practically around 50 MB in a normal browser tab. The limit is your device's memory, not a server quota.

Who uses this

Students and applicants

A portal that will only accept 50 KB. Exam boards, visa forms and job sites cap uploads. Set the number, keep the face recognisable.

Site owners

Images that do not wreck page speed. Hit a per-image budget before upload, so Core Web Vitals stay green without a build step.

Office and admin

A photo too big to email. Bring an attachment under the limit without opening desktop software.

Anyone with a phone

Huge camera files. Modern phone cameras produce 10–20 MB images that most forms simply refuse.

Limitations

  • Compression is lossy. If your original is far above the target, some quality loss is unavoidable — the tool minimises it, it cannot eliminate it.
  • Screenshots of text and UI compress badly as JPEG. Below roughly 100 KB they go visibly soft; reducing dimensions usually looks better than pushing quality down.
  • Re-compressing an already-compressed file compounds the loss. Work from the original whenever you have it.
  • Very large files are bounded by your device's memory rather than by any quota we set. On a phone, expect trouble well before 50 MB.
  • Animated GIFs and multi-frame images are not supported; the first frame would be all that survived.

Questions about this tool

Will the image lose visible quality?

Some, unavoidably, if the original is far above the target. ToolZool minimises it by finding the highest quality that still fits, and reducing dimensions only when quality alone cannot get there.

Which formats can I put in?

JPG, PNG, WebP and AVIF. Output is JPEG or WebP; WebP reaches a given size at better quality, but check the form you are submitting to accepts it.

Is there a file size limit?

Practically around 50 MB in a normal browser tab. The constraint is your device memory rather than a server quota.

Is EXIF and location data removed?

Yes. Re-encoding drops camera, timestamp and GPS metadata. Orientation is applied to the pixels first, so the image does not come out rotated.

Does the result go over my target?

No. The target is treated as a ceiling. If no setting can reach it — which happens when a target is very small and the image very detailed — the tool tells you the smallest size it managed instead of silently handing you a file that is too big.

Related tools

IMG / 02 Resize image to exact dimensions Pixel-exact width and height, with sensible cropping and no upscaling surprises. In build
IMG / 03 Image format converter Convert in both directions, with quality control. In build
PDF / 01 Compress PDF to exact size Bring a PDF under an upload cap while keeping the text readable and selectable. In build

Related guides

How-to · 7 min

How to hit a 50 KB limit without wrecking the photo

The order of operations that keeps a heavily compressed photo looking like a photo, and the one mistake almost everyone makes first.

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Decoding, colour transforms, discrete cosine transforms and quantisation — where the quality actually goes, and why doing it in a tab is now realistic.

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Troubleshooting · 6 min

Why an upload form keeps rejecting your file

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About this tool

Most image compressors give you a quality slider and leave you to guess. That is the wrong way round, because the constraint you were handed is a number: 50 KB for an exam portal, 2 MB for an email attachment, 500 KB for a page that has to stay fast. This tool works from the number. It searches encoder quality levels for the highest one whose output still fits under your target, and only reduces dimensions when quality alone cannot get there. You get the largest file that fits — which is also the best-looking one.