Compress JPG Free - Reduce File Size Online

Shrink JPG photos to a fraction of their original size with barely visible quality loss. Perfect for email attachments, website uploads, and social media posts that have file size limits. Drop one or many JPGs, set the quality slider, and download compressed versions instantly. Process dozens of images at once. Everything runs in your browser, so your photos are never uploaded to any server. No sign-up, no watermark.

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When to use it

ID photo for a government upload form

Drop the JPG, choose "Target size" and set "Make each file under" to the form limit. The tool lowers quality step by step, and shrinks the dimensions if it has to, until the file fits.

Make a gallery load faster

Set "Quality" to about 75 and "Max size (longest side)" to 1920 px (FHD). Photos shot at 12 megapixels shrink dramatically while still looking sharp on screens.

Check the difference before sharing

After converting, read the "Before" and "After" counters and the per-file "% smaller" label. If it is too soft, press "Convert again with new settings" with a higher "Quality".

How to use

Drop JPG images into the box or click to choose them.
Set the output format to JPG and adjust the quality slider. Around 80% gives a great balance.
Press Convert and download compressed images individually or all at once as a ZIP.

How it works

Each JPG image is decoded by your browser, drawn onto an HTML Canvas element, and re-encoded as JPEG at your chosen quality level. Lower quality means more aggressive compression and smaller files. At 80%, most photos look identical to the original while the file shrinks by 50-80%. The quality slider gives you full control over the size/quality trade-off. EXIF metadata (location, camera info) is removed during re-encoding, which also helps reduce file size. Everything runs locally using standard Web APIs. How to verify. Also available as a free REST API for developers and AI agents (edge-processed, zero retention).

Also available as: Image Converter & Compressor | Compress Images | Compress PNG

FAQ

How much can I reduce a JPG file size?

At 80% quality, files typically shrink by 50-80%. The exact savings depend on the image content and original compression level.

Will compression make my photos look bad?

At 70-80% quality, the difference is nearly invisible. Below 50%, compression artifacts become noticeable, especially around sharp edges.

What quality setting should I use?

80% is ideal for most uses. Use 90% if quality is critical. Use 60-70% for thumbnails or when file size is the priority.

Can I compress many JPGs at once?

Yes. Drop or select multiple files. They are all compressed and can be downloaded individually or as a single ZIP.

Are my photos uploaded?

No. All compression runs locally in your browser using HTML Canvas. Your photos never leave your device.

What quality number should I use?

About 80 looks the same to most people and saves a lot. Go to 60 to 70 for chat or web thumbnails, and stay at 90 or higher for pictures you plan to edit or print.

Does compressing the same JPG again damage it?

Each save at lower quality discards some detail. Keep your original and compress from it, rather than compressing a result repeatedly.

Why did a file stay the same size?

If the picture is already well optimized, the tool keeps the original and shows a message that it is already optimized.

Last checked: October 10, 2026 · Dagochim team