Question 1

Why use this instead of Squoosh?

Accepted Answer

Squoosh exposes more codecs (AVIF, MozJPEG tunables). This compressor is a faster local drop for PNG/JPEG you are about to commit. If you need MozJPEG trellis or a side-by-side codec bake-off, use Squoosh. If you need “make this screenshot smaller without uploading it,” stay here.

Question 2

What is the difference between lossy and lossless compression?

Accepted Answer

Lossy compression (JPEG, WebP-lossy, AVIF) permanently discards visual information that humans don't easily notice, high-frequency details, subtle color shifts. The more you compress, the more visible the artifacts: blocking, banding, blur around sharp edges. Lossless compression (PNG, WebP-lossless) reduces file size without losing any pixel data, but the savings are typically 10-50% versus 70-95% for lossy. Pick lossy for photos; lossless for icons, logos, screenshots with text, and anything you'll re-edit.

Question 3

Why should I use WebP format?

Accepted Answer

WebP (Google, 2010) typically produces 25-35% smaller files than equivalent JPEG or PNG at the same visual quality. It supports lossy, lossless, alpha transparency, and animation in one format. Browser support is universal in 2026, Chrome, Firefox, Safari (14+), Edge. For new projects, WebP is the default. Even better: AVIF (next-gen, ~50% smaller than JPEG), though support is still slightly behind. Use `<picture>` with AVIF/WebP/JPEG fallbacks for maximum coverage.

Question 4

Does compressing images affect SEO?

Accepted Answer

Yes, significantly. Page speed is a confirmed Google ranking factor since 2018, and image weight is the single largest contributor to slow pages. Reducing a 2MB hero image to 200KB improves your Largest Contentful Paint (LCP) score, one of three Core Web Vitals Google uses for ranking. Better LCP → better rankings → more traffic. Image compression is one of the highest-ROI SEO tasks available.

Question 5

What is a good quality setting for JPEGs?

Accepted Answer

For most web use, 75-85% quality is the sweet spot. Above 90% you're keeping data humans can't see; below 65% artifacts become visible. For thumbnails, 60-70% is fine. For hero images, 80-85%. For high-DPI screens (Retina), you can often drop quality to 70% because the image is being displayed smaller than its native resolution, the over-sampling masks compression artifacts.

Question 6

Is it safe to upload my personal photos here?

Accepted Answer

Yes, you're not actually uploading them. The Image Compressor performs all processing locally in your browser using the Canvas API. Your photos never reach a server, no analytics, no telemetry. As a bonus, the tool strips EXIF metadata (GPS coordinates, camera serial, date/time) during re-encoding, which is itself a privacy improvement, especially for photos taken by phones.

Question 7

Should I use PNG or WebP for images with transparency?

Accepted Answer

WebP, almost always. WebP supports alpha transparency (like PNG) and produces files 25-50% smaller. The only reasons to keep PNG: (1) you're publishing to a venue that doesn't accept WebP (some email clients, very old browsers), (2) the image is tiny and the savings are negligible, (3) you need 16-bit color depth (rare). For website icons, hero illustrations, screenshots with transparent backgrounds, WebP wins.

Question 8

What's the difference between resizing and compressing?

Accepted Answer

Resizing reduces pixel dimensions (4000×3000 → 1200×900). Compressing keeps the same dimensions but reduces file size by re-encoding at lower quality. Resize first, then compress, a downscale from 4000px to 1200px can drop file size 90% by itself, often beating any quality reduction. Most 'huge image' problems are actually 'wrong-sized image' problems: a phone photo (4000px wide) displayed in a 600px container.

Question 9

What standards does Image Compressor validate against?

Accepted Answer

Image Compressor checks compliance with JPEG (ISO/IEC 10918), PNG (ISO/IEC 15948), WebP (RFC 9649).

Question 10

What are the limitations of Image Compressor?

Accepted Answer

Compression is lossy for JPEG/WebP, quality loss is irreversible Does not support AVIF encoding in all browsers Large images may cause browser memory issues

Format	Compression Type	Typical Saving	Optimal Quality
JPEG	Lossy (DCT)	50-80%	75-85%
WebP	Lossy/Lossless	60-90%	75-80%
PNG	Lossless (Deflate)	10-40%	100% (Lossless)
AVIF	Lossy (AV1)	70-95%	60-70%

Image Compressor

What is Image Compressor?

Frequently Asked Questions

Technical Deep Dive

Image Compressor

01 Format Compression Matrix

02 Optimization Workflow Pipeline

Runs 100% in your browser

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