Image Compressor
Reduce image file size with adjustable quality. Batch compress multiple images and download as ZIP.
Drop images here
or click to browse — JPG, PNG, WebP, AVIF accepted
Results
BEFORE / AFTER COMPARISON
Drag the divider to compare
Settings
💡 Tip: WebP typically reduces file size by 25–35% vs JPEG. AVIF by 40–50%. Both are supported by all modern browsers.
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How image compression works
Image compression reduces file size by removing or reorganizing pixel data. There are two fundamentally different approaches: lossy and lossless.
Lossy compression — used by JPEG, WebP, and AVIF — permanently discards image information that the human eye is least sensitive to, particularly fine high-frequency detail in smooth gradients. The quality slider controls how aggressively data is discarded. A quality setting of 80% on a photo typically produces a result visually identical to the original while cutting file size by 60–75%.
Lossless compression — used by PNG and WebP lossless — reorganizes pixel data more efficiently without discarding any of it. The decompressed result is identical to the original. This is ideal for screenshots, diagrams, logos, and any image containing sharp text, because lossy compression creates visible artifacts on high-contrast edges.
This tool uses your browser's built-in HTMLCanvasElement.toBlob() API, which implements JPEG and WebP encoding natively. No data ever leaves your device.
Quality settings: what the numbers mean
For archival copies, images you'll edit again, or professional print use. File sizes are still 40–60% of uncompressed PNG.
Visually indistinguishable from the original on-screen. 60–75% size reduction. The right choice for nearly all website and social media images.
Visible compression on close inspection. Use for thumbnails, preview images, or when bandwidth is the primary constraint.
Noticeable blocking and ringing artifacts, especially on text and sharp edges. Only appropriate for low-stakes previews or extremely bandwidth-constrained contexts.
Format guide: which to choose
JPEG — the safest choice for photos and images with gradients. Universally supported everywhere including email clients, older browsers, and every printing system. No transparency support.
WebP — recommended for all new web projects. 25–35% smaller than JPEG at equivalent visual quality, supports transparency, and is supported by all browsers released after 2020. When in doubt, use WebP for the web.
AVIF — the most efficient format available, 40–50% smaller than JPEG. Supported in Chrome 85+, Safari 16+, and Firefox 113+. Encoding is slower, so it's best for static images rather than bulk conversions.
PNG — use only when you need lossless quality or transparency (logos, screenshots, icons). PNG photos are typically 3–10× the size of an equivalent WebP.
Step-by-step instructions
- Drag and drop your image files onto the upload zone, or click it to open the file picker. JPG, PNG, WebP, AVIF, GIF, and BMP are all accepted.
- Each file appears as a result row showing the original size, compressed size, and percentage saved.
- Adjust the Quality slider (default 80) to balance file size against visual quality. Changes apply live — results update immediately.
- Select an output format. Choosing Same as input compresses without converting. Choosing WebP or AVIF will typically reduce file sizes further.
- Toggle Strip EXIF on to remove GPS location, camera model, and shooting settings from JPEG files. This is on by default for privacy.
- Click Download All to save a ZIP containing all compressed files, or click the individual download icon next to any single result.
Frequently asked questions
Will compressing make my image look worse?
At quality 80 or above, the difference is typically invisible on a screen, even when zooming in. The compression removes data the eye cannot distinguish in normal viewing conditions. If you're compressing an image that will be printed large or edited further, use quality 90+.
Can I compress a WebP or AVIF file?
Yes. The tool accepts WebP and AVIF as inputs. You can compress them further (re-encoding at a lower quality) or convert them to another format simultaneously. Note that re-encoding an already-lossy-compressed image at the same quality does add a second generation of quality loss, so start from the original whenever possible.
How many images can I compress at once?
There is no hard limit. Processing happens in your browser using the Canvas API, so the practical limit is your device's available RAM. On a typical laptop you can comfortably process 50–100 images per batch. Very large individual files (over 50 MB) may be slow on older hardware.
Are my images uploaded to a server?
No. All processing runs locally in your browser using the Web Canvas API. Your files are never transmitted to any server. You can verify this by disconnecting from the internet — the tool will still work perfectly.
Why is PNG compression not reducing the file size much?
PNG is lossless, so the quality slider has no effect. The browser's PNG encoder applies standard DEFLATE compression, which is already efficient. If you need a much smaller file, convert the PNG to WebP (lossy) — a photo PNG can typically be reduced by 70–80% this way.
Related guides: Complete image compression guide · Which image format should I use? · Images and Core Web Vitals