Image Compressor

📁 Click to select images, or drag & drop them here (multiple files supported)

Output Format

Compression Preset

Quality: 50%

Applies to JPEG/WebP output. PNG is always saved lossless (quality has no effect).

Max Width (px)

Max Height (px)

Leave blank to keep original dimensions. Aspect ratio is always preserved.

How to Use Image Compressor

1

Upload Your Image

Choose the image you want to shrink.

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2

Choose a Compression Level

Select a compression preset or adjust the quality slider and output dimensions.

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3

Download the Compressed Image

Preview the size reduction and download your smaller, optimized image.

How Image Compression Reduces File Size

Formats like JPEG use "lossy" compression — they discard some visual information the human eye is less sensitive to (subtle color gradients, high-frequency detail) in exchange for a much smaller file size. This tool lets you control the compression quality level, trading off file size against visual fidelity: lower quality settings discard more detail and produce smaller files, while higher settings preserve more detail at the cost of larger files. All processing happens locally using your browser's built-in image encoding, so your photo never leaves your device.

A Worked Example

A typical 4000×3000 pixel photo straight from a phone camera might be 6–8 MB uncompressed. Compressing it at 80% JPEG quality often reduces it to somewhere around 1–2 MB with minimal visible quality loss for most viewing purposes, while a more aggressive 50% quality setting might bring it down to 400–600 KB, with more noticeable softening of fine detail, especially visible if you zoom in.

Common Mistakes to Watch For

Over-compressing images with text or sharp edges. Lossy compression tends to introduce visible artifacts around hard edges and small text faster than it does on photos with soft, natural gradients — use a higher quality setting for screenshots or graphics with text.
Re-compressing an already-compressed JPEG repeatedly. Each round of lossy re-compression discards a bit more detail — where possible, always compress from the original, uncompressed source rather than compressing a file that's already been compressed before.

When This Tool Helps — and When It Isn't Enough

Useful for reducing upload sizes, speeding up website load times, or fitting images within an email or form's size limit. For situations needing pixel-perfect quality (like professional print or archival storage), lossless formats or minimal compression settings are more appropriate than aggressive lossy compression.

File Size & Browser Notes

Compression runs locally in your browser using the same underlying encoders modern browsers ship with, so results are consistent whether you're on a laptop or a phone, and there's no daily usage limit.

Frequently Asked Questions

How much smaller will my compressed image be?+

It depends heavily on the original image and quality setting you choose, but photos often shrink by 50–80% at a moderate quality setting with minimal visible difference. Screenshots and graphics with text compress less predictably.

Is there a quality setting I should use by default?+

A quality setting around 70–80% is a reasonable starting point for photos, balancing file size and visual quality. For images with text or sharp lines, a higher setting helps avoid visible artifacts.

Can I compress a PNG file with this tool?+

Yes, though PNG compression here is lossless re-encoding rather than the lossy quality-slider compression used for JPGs, so size reduction on PNGs is typically smaller than what you'd see converting a photo-style PNG to JPG.

Will compressing the same image multiple times keep reducing size?+

Repeated lossy compression keeps discarding a little more detail each time and eventually stops meaningfully reducing file size while continuing to reduce quality — it's best to always compress from the original, uncompressed file.