Image Tools
Image Compressor
Drop an image, drag the quality slider, and download a smaller file. Compress JPG, PNG, and WebP right in your browser — no uploads, no signup, no watermarks.
What makes this tool different
Quality slider
Fine-tune the balance between file size and visual quality with a 10-100% slider, with a live size comparison.
WebP, JPEG, and PNG output
Re-encode to the format that makes sense — WebP is smallest for web use, JPEG for photos, PNG for graphics.
No uploads, 100% private
Compression happens in your browser with the Canvas API. Your images never leave your device.
Max width control
Cap the output width to shrink large images down to web-friendly dimensions at the same time.
About this tool
Image Compressor: everything you need to know
Large images slow down your site, bloat your email, and eat up storage. OpenToolLab's image compressor shrinks JPG, PNG, and WebP files with a simple quality slider — right in your browser, with nothing uploaded.
The tool uses the Canvas API to re-encode your image at the quality you choose, showing the before and after size so you can balance file size against visual quality. A 10-100% slider plus optional max-width control covers everything from 4K photos to web thumbnails.
For websites, WebP output delivers the smallest files at high quality — typically 25-35% smaller than an equivalent JPEG. The format selector lets you output WebP, JPEG, or PNG depending on what your use case needs.
Because compression happens locally, the tool is private by default, works offline, and has no file-size limits. There's no signup, no watermark, and no upload queue.
Compress once, then pair it with OpenToolLab's base64 image encoder to embed the result directly into HTML, or convert it to a favicon or SVG — a full image workflow in one place.
FAQ
Image Compressor — frequently asked questions
How do I compress an image online for free?
Drop the image into the upload area, move the quality slider down, and click Compress image. The tool re-encodes the image in your browser and gives you a smaller file to download — free, with no signup.
Can I compress an image without losing quality?
You can minimize visible loss by keeping the quality slider around 70-80%. At that range most photos look identical to the original while the file size drops significantly. WebP output also keeps quality high at smaller sizes.
How do I compress a JPG online?
Drop the JPG, choose JPEG or WebP output, set the quality, and click Compress image. WebP usually gives the smallest JPG-like result without visible quality loss.
How do I compress an image to 100kb?
Drop the image, lower the quality slider, and check the output size. If it's still above 100kb, reduce quality further or cap the width — then re-compress until the size shows under 100kb.
How do I compress an image to 50kb?
Set the quality around 50-60% and cap the width to something like 800px, then compress. For very large originals, work in steps — lower quality first, then width — until the after-size reads under 50kb.
Is it safe to compress images here?
Yes. The image is processed entirely in your browser with the Canvas API — it's never uploaded, stored, or tracked. Open your Network tab and you'll see zero requests.
Can I compress PNG files too?
Yes. PNG works, though it's a lossless format so size savings are smaller. For PNGs with photos or gradients, switching to JPEG or WebP output gives much larger savings.
Is there a signup or limit?
No signup, no API key, no file-size limits, and no watermark. Since everything runs locally, you can compress as many images as you like.
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