Compress PNG to 50KB Online
Getting a PNG under 50KB nearly always means changing format. Set the output to WebP to keep transparency, or JPEG if you do not need it — then the target does the rest.
Last updated: August 2026
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Supports JPG, PNG, WebP and AVIF
There is a mechanical fact behind this task that most guides skip: you cannot compress a PNG to a target file size, and no tool can. PNG is lossless — it has no quality dial to turn down. Its size is decided entirely by the image's dimensions and how much repeated colour it contains, so the only levers are making the picture smaller or making it simpler. That is why the target-size field here switches off the moment you choose PNG as the output format.
Which leaves two honest routes to 50KB. The first is to change format: set the output to WebP and you keep the transparency PNG users care about while gaining a real quality dial, so the 50KB target becomes achievable. The second is JPEG, which is smaller still but has no alpha channel — transparent areas become white, which rules it out for logos and icons meant to sit on coloured backgrounds.
For most things people are trying to shrink — logos, icons, UI assets, illustrations with flat colour — WebP at 50KB looks better than anything PNG could manage at the same size anyway. The format was designed for exactly this content. Staying in PNG is the right call only when you need a byte-exact master or when something in your pipeline genuinely cannot read anything else.
How to get a PNG under 50KB
- 1
Add your PNG
Drop it in. Everything is decoded and re-encoded in your browser, so unreleased design assets never leave your machine.
- 2
Change the output format
Choose WebP to keep the alpha channel, or JPEG if the image has no transparency to lose. The target-size field becomes available as soon as the output is a lossy format.
- 3
Set the target to 50
Quality is then chosen automatically to land just under 50KB, rather than you guessing at a percentage.
- 4
Check edges and text closely
Flat graphics show compression artefacts around hard edges before photographs do. If lettering looks fringed, reduce the image dimensions instead of pushing the quality lower.
Pro tip: If the file must stay PNG, shrink the picture rather than the quality — because there is no quality to shrink. Halving the dimensions of a PNG cuts its pixel count to a quarter and its file size along with it, losslessly, with none of the edge artefacts a lossy format would introduce. For an icon or a logo that is displayed small anyway, exporting at the size it is actually shown is usually the entire solution, and it is the only lever PNG really offers.
Troubleshooting: If the target-size field is greyed out, the output format is still PNG — target sizes only apply to lossy formats. If transparency disappeared, the output was set to JPEG rather than WebP. If text or logo edges look fringed after conversion, the quality needed to reach 50KB is too low for that content; reduce dimensions instead so less compression is needed. And if the PNG barely shrinks under lossless optimisation, it was probably already optimised.
For a larger budget with the same approach, Compress PNG to 100KB. To understand the format change itself, Convert PNG to WebP covers what is preserved and what is not, and Convert PNG to JPG covers the transparency trade. To stay lossless and optimise properly, Optimize PNG for Faster Loading. The full Compress Image tool has every option in one place.
Frequently asked questions
How do I compress a PNG to 50KB?
Change the output format to WebP or JPEG first, then set the target to 50KB. PNG itself has no quality setting, so target-size compression is not available while the output stays PNG — WebP is the usual answer because it keeps transparency.
Why can I not set a target file size for PNG?
Because PNG is lossless. There is no quality dial to trade against file size — the size is determined by the image dimensions and how compressible the content is. Target-size compression works by searching quality settings, which only lossy formats have.
How do I shrink a PNG and keep transparency?
Convert it to WebP. WebP supports an alpha channel like PNG, but is lossy, so it can hit a size target while keeping the transparent background intact. For most logos and icons it also looks better at a given file size than PNG can manage.
Can I reduce PNG size without changing format?
Only by reducing dimensions or simplifying the image, both of which are lossless in PNG terms. Halving the width and height cuts the file size substantially with no compression artefacts at all — for an icon displayed small, exporting at its display size is usually enough on its own.
Are my images uploaded when compressing?
No. Everything runs inside your browser on your own device — nothing is uploaded, stored, or logged, and the tool works offline once the page has loaded.
Looking for the full-featured version? Open the main Compress Image tool.
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