Free Image Compressor — Shrink JPEG, PNG, and WebP in Your Browser

What Is an Image Compressor?

An image compressor reduces the number of bytes in a photo or graphic while trying to keep the picture looking close to the original. That matters whenever a file is too large to email, too slow to load on a product page, or over a form's upload limit. Instead of shipping a 6 MB camera JPEG when a 400 KB version would look the same on a phone screen, you encode the image with a lower quality setting or a more efficient format and keep the visual result.

This compressor runs entirely in your browser. Files are read with the browser's own file APIs and re-encoded on your device. Nothing is uploaded to a server, there is no account, and there is no daily cap beyond a small batch size that keeps the tab responsive.

Why Use This Compressor

Large images are one of the most common reasons a page feels slow. A homepage hero, a blog thumbnail, or a screenshot in documentation can each weigh several megabytes if they came straight from a camera or a design tool. Shrinking those files before you publish them cuts bandwidth, helps Core Web Vitals, and makes attachments more polite in email and chat.

This tool is built for short, local jobs rather than a full media pipeline:

• Batch of up to five. Select two to five images (or just one) and compress them in a single pass instead of repeating the same clicks per file.
• Quality you control. The Output quality slider sets how aggressively JPEG and WebP are encoded. Higher values keep more detail; lower values save more bytes.
• Size comparison on the card. Each thumbnail shows the original size and, after compression, the new size and how much smaller the file became.
• Private by default. Processing never leaves your device. That is useful for screenshots, invoices, or photos you would rather not send to a third-party upload service.

PNG files are accepted, but they behave differently from JPEG and WebP. PNG is often already lossless. Re-encoding a PNG in the browser may not shrink it much, and if the result would be larger, the tool keeps the original file.

How to Use the Tool

The widget is a small workspace: file controls at the top, a drop area, a quality slider, then Compress and Download all.

Step 1 — Add images. Use Select files or drag JPEG, PNG, or WebP files onto Drop images here. You can add more files until the queue holds five. Each file must be 25 MB or smaller. Unsupported types are skipped with a short message: Only JPEG, PNG, and WebP files are supported. If you try to add a sixth image, the extra files are ignored and you will see You can compress up to 5 images at a time.

Step 2 — Review the queue. Each card shows a preview, the file name, a type badge (JPG, PNG, or WEBP), and the original size. Remove one image with the × on that card, or empty the queue with Clear all. When two or more images are queued, the arrows beside the strip scroll the thumbnails.

Step 3 — Set output quality. Output quality ranges from 10 to 100. The number field is read-only and mirrors the slider. The default of 80 is a practical starting point for photographs. Changing the slider clears previous compressed results so you do not download a file encoded at an old setting.

Step 4 — Compress. Click Compress. The badge on the button shows how many files are in the queue. Cards show Compressing… one after another. If a file cannot be decoded, that card shows Could not compress this image. Try another file. and the rest of the batch still runs.

Step 5 — Check the savings. A finished card shows original size → compressed size and a percent such as 62% smaller. If the encoder could not beat the original, the card reads Already as small as this quality allows and the download is the original file.

Step 6 — Download. Use Download on a single card or Download all for every finished file. Downloads are named with a -compressed suffix, for example hero.jpg becomes hero-compressed.jpg. Download all is disabled until at least one image has finished compressing.

Worked Examples

Results depend on the photo, so treat these as typical ranges rather than guarantees.

Example 1 — Phone JPEG at quality 80. A 4.2 MB JPEG from a phone camera, 4000×3000 pixels, often lands somewhere between about 600 KB and 1.8 MB at quality 80 with the original pixel dimensions kept. Fine detail (foliage, fabric) shrinks less than a smooth sky.

Example 2 — Same JPEG at quality 50. Dropping Output quality to 50 usually cuts another large slice off the file. Look at faces and text in the preview: if you see banding or muddy edges, move the slider back up and compress again.

Example 3 — Screenshot PNG. A 1.1 MB PNG of a UI often barely moves, because PNG already stores flat colors efficiently. The tool may report that the file is already as small as this quality allows. If you need a much smaller screenshot for the web, export or convert it to WebP or JPEG in a graphics app first, then compress that file here.

Example 4 — Batch of three product photos. Add three JPEGs, leave quality at 80, click Compress, then Download all. You get three -compressed files without uploading anything. That is the intended 2–5 image workflow for a product listing or a blog post.

Tips and Best Practices

• Start at 80, then nudge. For photos, 80 is a sensible default. If the compressed size is still too large for an email limit, try 70 or 60 and compare the preview.
• Keep resolution when you only need bytes. This compressor does not resize. Dimensions stay the same so you do not accidentally serve a tiny thumbnail as a hero image. If you also need a smaller pixel size, resize in an editor first.
• Prefer JPEG or WebP for photos. Photographs compress well with lossy encoding. UI chrome, logos with sharp edges, and images that need a transparent background usually belong in PNG — and PNG may not shrink much here.
• Watch text in screenshots. Lossy compression can make small type look soft. Keep quality high, or keep PNG for anything that is mostly text.
• Stay within five files. The cap keeps the tab from decoding a dozen huge photos at once. Run another batch if you have more.
• Name files before you start. The download suffix is predictable. Clear names on the originals make the compressed copies easier to drop into a CMS.
• Do not compress twice at a low quality. Running an already-crushed JPEG through a low quality setting again adds artifacts. If you need a different size, go back to the original camera file.

Frequently Asked Questions

Are my images uploaded to a server? No. Files are read in the browser and re-encoded on your device. They are not sent to Quick Tools, stored in localStorage, or attached to a URL.

Which formats can I compress? JPEG (including .jpg and .jpeg), PNG, and WebP. Animated GIF and SVG are not supported in this version. HEIC from some phones is also not accepted unless your OS already converted it to JPEG.

Why did my PNG barely change? PNG is typically lossless. Browser re-encoding does not apply a JPEG-style quality slider the same way. If the new file would be larger, the original is kept.

Does compression strip EXIF data? Yes. Location, camera model, and other metadata are not preserved, which is usually what you want before publishing a photo on the web.

What does the quality number mean? It is the encoder quality from 10 (smallest, most artifacts) to 100 (largest, fewest artifacts). It is not a guaranteed file size. Two photos at quality 80 can still differ by megabytes depending on detail and noise.

Can I compress more than five images? Not in one queue. Compress and download the current batch, click Clear all, then add the next set. The limit is there so a single tab stays usable.

Related Tools

More image tools are on the way. Until then, you can browse the rest of the free utilities in the Tools section — all designed to run privately in your browser.