Drop JPG, PNG or WebP files into the Compress tab to get smaller copies, or use the Convert tab to change formats, including iPhone HEIC photos. Both tabs run inside your browser, so your images never reach a server. There is no signup, watermark or daily limit.
How to use the tool
- Pick the Compress or Convert tab.
- Drop images onto the upload box, or tap it to choose files. You can add many at once, and they process one after another.
- Read the before-and-after size beside each file, then download files one by one or press Download all (ZIP).
- Change any setting, and the tool reprocesses the whole list, so you can compare results without adding the files again.
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Auto mode vs Advanced mode in the Image Compressor
Auto mode keeps your original dimensions and uses settings chosen to look identical to the source: about 88% quality for JPG and 90% for WebP. For PNG files, it reduces the colour palette only when a built-in quality check confirms the change is invisible. Otherwise, the PNG stays lossless. If the result would be larger than your original, the tool keeps your original and says so, so a file never gets heavier.
Advanced mode gives you three controls: a quality slider from 40 to 100, a maximum width in pixels, and an output format (same as original, WebP, JPG or PNG). PNG has no quality scale, so the slider works differently there. At 95 and above, the PNG stays lossless, and lower values cut the palette to 256, 128 or 64 colours. Use Advanced when you need a specific result, such as a 1600 px wide banner under 200 KB.
Why a PNG sometimes barely shrinks
Screenshots and graphics exported from design tools are often optimised already, so there is little left to remove. Photographs saved as PNG are the opposite case. They contain millions of colours, and reducing them would damage the image, so Auto mode leaves them lossless. For photos, choose Advanced mode with WebP or JPG as the output.
Convert between formats
The Convert tab reads JPG, PNG, WebP, AVIF, GIF, BMP, SVG, HEIC, HEIF and TIFF files. It exports JPG, PNG, WebP, AVIF, BMP, ICO or TIFF. A few details affect the result:
- HEIC to JPG: iPhone photos become files that open in any app, browser or upload form.
- Transparency: JPG cannot store transparent pixels, so they turn white. Choose PNG or WebP to keep them.
- GIF: only the first frame is converted. Animation is not preserved.
- ICO: the image is fitted into a square of up to 256 px, which suits favicons.
- AVIF: export depends on the browser. Chrome, Edge and Firefox support it, and the tool shows a message where it isn’t available.
Which format should you choose?
| Format | Best for | Watch out for |
|---|---|---|
| JPG | Photographs | No transparency, and each re-save adds loss |
| PNG | Screenshots, logos, transparency | Very large files for photos |
| WebP | Website images of any kind | Some older software cannot open it |
| AVIF | The smallest web images | Slow to encode, and not exportable in every browser |
| HEIC | Saving space on an iPhone | Many sites and Windows apps reject it, so convert it |
| TIFF, BMP | Print workflows and legacy software | Files are very large |
| ICO | Favicons | Limited to 256 px |
What happens to your files
Your browser decodes and re-encodes each image itself, so nothing is uploaded. A few small helper scripts load from the jsDelivr CDN only when needed: HEIC conversion, TIFF support, ZIP creation and PNG compression. Those downloads are code, not your files.
Compression removes EXIF metadata, including GPS coordinates, camera model and timestamps, while keeping the photo’s orientation. That is useful before posting pictures publicly. If you need copyright metadata to survive, keep your original file as well.
Limits to know about
Browsers cap canvas size at roughly 16,000 pixels per side, so larger images are scaled down to fit. Very large batches depend on your device’s memory, so on a phone, process them in smaller groups. RAW camera files and PSD documents cannot be opened by any browser, so export them to JPG or TIFF first.
Getting better results on a website
Resize before you upload. A 4000 px photo displayed at 800 px wide wastes most of its bytes. Set Max width in Advanced mode to about twice the display width, which keeps the image sharp on high-density screens.
Compress before uploading to WordPress, not after. WordPress stores your original upload alongside the resized copies it generates, so a lighter source also saves server storage. WordPress accepts WebP uploads from version 5.8 and AVIF from version 6.5, so this tool’s WebP and AVIF outputs can go straight into your media library.
Choose the format by content. Use WebP for most site images, and JPG when you need compatibility with older tools.
Frequently asked questions
Is this image compressor free?
Yes. It has no signup, watermark or daily limit. The only limit is what your device can handle.
Are my images uploaded anywhere?
No. Compression and conversion happen in your browser, and your files stay on your device.
Will compression reduce image quality?
Auto mode aims for visually identical results, but JPG and WebP are lossy formats, so pixel-level changes do exist even when you can’t see them. PNG files stay lossless unless the colour reduction passes the quality check. Choose Advanced mode if you want to control the trade-off.
Why did my file come out the same size?
The tool found no way to shrink it without a visible change, so it kept your original. PNG photographs are the most common case. Try Advanced mode with WebP or JPG output.
How do I convert HEIC to JPG?
Open the Convert tab, drop your HEIC files in, choose JPG and download the results. You can convert a whole batch at once and download it as a ZIP.
What is the best image format for a website?
WebP suits most images. Use AVIF where you want the smallest files and accept browser-dependent export, and use JPG as the widely compatible option.
Does it remove EXIF and GPS data?
Yes, all metadata is stripped, and the photo’s orientation is preserved.
Is there a file size limit?
There is no fixed limit. Images over about 16,000 pixels on a side are scaled down, and very large batches depend on your device’s memory.