How does the JPEG compressor work?

The tool uses the browser's built-in Canvas API to re-encode your JPEG images at the quality level you choose. It draws the image onto an HTML canvas element and exports it back as JPEG with the specified quality (1–100%). No server is involved — everything runs locally in your browser.

Will my images be uploaded to a server?

No. This JPEG compressor runs entirely inside your browser. Your images are never uploaded to any server, never stored anywhere online, and never shared with anyone. All processing happens locally on your device.

Can I compress multiple JPEG files at once?

Yes. You can drag and drop or select multiple JPEG/JPG files at once (up to 20 files). All images are compressed simultaneously with your chosen settings and can be downloaded individually or all at once as a ZIP file.

Does compressing a JPEG reduce image dimensions?

By default, compression does not change image dimensions — only the quality/file size. You can optionally enable the 'Resize' option to set a maximum width or height, which will scale down large images before compression for even greater file size reduction.

JPEG Compressor — Compress JPEG & JPG Images Online Free

Q: What quality setting should I use?

For web images, 60–80% quality provides a good balance between file size reduction and visible quality. For print or professional use, 85–95% is recommended. Below 50% produces noticeable compression artifacts. The default setting of 75% works well for most use cases.

Reduce JPEG file size by up to 90% with adjustable quality. Batch compress multiple images, compare before and after with an interactive slider, and download instantly. Files never leave your device.

⚡ Batch Compress

🔍 Before/After Slider

📦 ZIP Download

🛡️ 100% Private

✓ Free · No Signup

100% Private. All compression runs in your browser using the Canvas API. Your images are never uploaded to any server — processing happens entirely on your device.

ToolLive's free JPEG Compressor lets you compress JPEG images online and reduce JPG file size by up to 90% — all in your browser, with no upload and no signup. Set your desired quality level with the slider, enable optional resizing, and compress up to 20 images at once. Each result shows original vs compressed size, savings percentage, and an interactive before/after comparison slider. Download individual images or all at once as a ZIP. Powered by the browser's Canvas API — no third-party service needed. Perfect for optimising website images, reducing email attachments, and saving storage space.

Compression Settings

Adjust quality and optional resize before uploading images

JPEG Quality

75%

1 — Smallest file 50 — Balanced 100 — Original quality

💡 Recommended: 60–80% for web images. 85–95% for professional/print use.

Resize (optional)

Max Size (px)

Output Format

Strip Metadata

Upload JPEG Images

Drag & drop or click to select — up to 20 files, any size

🖼️

Drop JPEG / JPG images here or click to browse

Supports .jpg, .jpeg — up to 20 files at once — any file size

Files never leave your device

How to Compress JPEG Images Online

Adjust Quality

Set the JPEG quality slider (1–100%). 75% is the default sweet spot. Lower = smaller file, higher = better quality.

Upload Images

Drag and drop up to 20 JPEG/JPG files, or click the upload area. All sizes and resolutions are supported.

Compare & Verify

Use the interactive before/after slider on each image to visually compare original vs compressed quality.

Download

Download images one by one, or click Download All to get a ZIP file containing all compressed images.

Frequently Asked Questions

How does this JPEG compressor work?

The tool uses the browser's built-in Canvas API. It loads each image onto an HTML canvas element, then exports it back as JPEG at your chosen quality level using canvas.toDataURL('image/jpeg', quality). No server is involved — the entire compression process runs locally on your device.

What quality setting should I use?

For website images and social media: 60–80% provides excellent size reduction with no visible quality loss to most viewers. For professional photography or print: 85–95%. For thumbnails and previews: 40–60%. The before/after slider helps you find the right setting for each image.

Are my original images changed or deleted?

No. Your original image files are never modified. The tool reads your files in memory, creates a new compressed version, and offers that new version for download. Your originals remain exactly as they were on your device.

Why is the compressed file sometimes larger than expected?

If your original JPEG was already heavily compressed (e.g. downloaded from the web), re-encoding it at the same or higher quality may produce a similar or slightly larger file. This is because re-encoding introduces a new round of JPEG artifacts. For already-compressed images, try a lower quality setting or enable WebP output for better compression.

Does compression change the image dimensions?

By default, no — dimensions are preserved. Enable the Resize option to set a maximum width, height, or dimension. This scales down large images proportionally before compression, which significantly reduces file size especially for very high-resolution originals (e.g. from DSLR cameras).

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