Question 1

Do these image tools send my photos to a server?

Accepted Answer

No. Every operation — compression, resizing, cropping, format conversion, SVG optimization — runs entirely in your browser using the Canvas API and JavaScript. Your images never leave your device. There is no server-side processing, no data stored, and no uploads. You can verify this by turning off your internet connection after the page loads — every tool will still work.

Question 2

What is the difference between lossy and lossless image compression?

Accepted Answer

Lossy compression (JPEG, WebP lossy) permanently removes fine detail and color information to achieve dramatic file size reductions — typically 60–90% smaller than uncompressed. The human eye rarely notices the difference at 75%+ quality settings. Lossless compression (PNG, WebP lossless) reorganizes the pixel data more efficiently without discarding any information — the decompressed image is pixel-identical to the original, but file size reductions are smaller (typically 10–40%).

Question 3

Which image format should I use for my website?

Accepted Answer

WebP is the best default for modern websites — it combines the benefits of both JPEG (compact photos) and PNG (transparency support) with 25–35% better compression than either. Use JPEG for photographs where you do not need transparency. Use PNG for logos, icons, screenshots, and graphics with transparency. Use SVG for logos and icons that need to scale — SVG is resolution-independent and typically the smallest format for vector graphics.

Question 4

Why does converting JPG to PNG make the file larger?

Accepted Answer

PNG uses lossless compression — it stores all pixel data explicitly without discarding any information. JPEG is lossy — it throws away some detail in exchange for smaller size. When you convert a JPEG to PNG, you take the JPEG's already-compressed (and slightly degraded) pixels and store them in PNG's lossless format, which requires more space to store each pixel precisely. The file gets larger, but no additional quality is lost after the initial JPEG compression.

Question 5

What resolution should I export my SVG to PNG at?

Accepted Answer

Export at 2× your target display size to account for Retina and HiDPI screens. If a logo will be displayed at 200×200px on your page, export the PNG at 400×400px. For icons that appear at multiple sizes (favicon, app icon), export at the largest required size and let the browser scale down — scaling down from a larger PNG preserves quality, while scaling up creates blurriness.

Question 6

How much file size reduction should I expect from SVG optimization?

Accepted Answer

SVGs exported from design tools typically reduce by 40–70% after optimization. The exact saving depends on how much editor metadata was embedded. Figma SVGs typically see 30–50% reduction. Illustrator SVGs (especially with "Preserve Illustrator editing capabilities" enabled) often see 60–80% reduction because of the large amount of AI-specific XML embedded. Simple hand-coded SVGs see less improvement since they already lack editor bloat.

Question 7

Why can't I open HEIC files on Windows?

Accepted Answer

HEIC uses the HEVC video codec for compression, which requires a license to decode. Apple licenses HEVC for its devices automatically. On Windows, you need to install the HEVC Video Extensions from the Microsoft Store (free or ~$1 depending on your Windows version). Alternatively, convert HEIC photos to JPG using this tool before sharing with Windows users — the resulting JPG opens natively everywhere.

Use case	Recommended quality	Notes
Blog / article hero image	75–85%	Visible on desktop at full width; balance quality and load speed
Product photos (e-commerce)	80–90%	Fine detail matters for conversions; keep quality higher
Social media uploads	70–80%	Platforms re-compress anyway; compress before upload to control output
Email attachments	60–75%	Smaller is better; email clients have strict size limits
Thumbnail / avatar	65–75%	Small display size means compression artifacts are invisible
Print / archival	95–100%	Use lossless PNG or maximum JPEG quality for print-quality files

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