Target format: the main decision
The target format is the whole point of the tool: JPG, PNG, or WebP. JPG is the universal photo format — everything opens it, and its lossy compression keeps photos small. PNG is lossless with transparency support, ideal for graphics, logos, and screenshots. WebP is the modern sweet spot: smaller than JPG, sharper per byte, transparency included.
Choose by destination: web publishing → WebP; maximum compatibility → JPG; pixel-exact graphics or transparency → PNG. There is rarely a wrong answer among sensible choices, but there are wasteful ones — like photos to PNG.
The quality slider
The quality slider matters when converting to a lossy format (JPG or WebP) — it sets how aggressively the encoder discards detail. Higher values preserve fidelity at larger sizes; lower values shrink files harder. The familiar 75–85 band serves most photos beautifully.
Converting to PNG ignores quality in the lossy sense — PNG is lossless, so every pixel survives regardless. If a PNG conversion disappoints on size, the answer is not a setting tweak but a different target format.
Automatic re-conversion
Change the target format or nudge the quality slider and the entire batch re-converts automatically within a moment. No apply button, no re-selecting files — the tool treats settings as live.
This makes experimentation free: flip between JPG and WebP targets and compare the resulting sizes on the cards directly. The numbers tell you which format serves each image best, no theory required.
Settings you will not find
There are no DPI settings, color profile controls, or metadata editors here — deliberately. The converter does one job: change the container format (and optionally the lossy quality) as cleanly as possible.
For color-critical print work or profile embedding, desktop software remains the right tool. For the everyday need — this PNG should be a JPG — these two settings are everything required.
A decision cheat sheet
If the settings still feel like guesswork, use this cheat sheet. Photo headed to the web: WebP at 75–80. Photo headed somewhere uncertain: JPG at 80. Screenshot for documentation: PNG. Graphic with transparency: PNG or WebP. Screenshot for email: JPG at 70. These five cover ninety percent of real-world conversions.
When no preset fits, fall back to first principles: will anyone open this on old software? Choose JPG. Does it contain text or transparency? Choose PNG or WebP. Is smallest file the goal? Choose WebP at the lowest quality that still looks clean at full zoom. Two questions, one answer, every time.
Frequently asked questions
Which target format should I choose?
WebP for web publishing (smallest), JPG for universal compatibility, PNG for lossless quality or transparency. Match the format to where the image will live.
Does the quality slider affect PNG output?
Not in the lossy sense — PNG is lossless, so pixels are preserved exactly. Quality matters when converting to JPG or WebP.
Do I need to click anything after changing settings?
No. Changing the format or quality automatically re-converts all images — the cards update on their own.
Can I convert to GIF or TIFF?
The tool covers PNG, JPG, and WebP — the formats that matter for web and sharing. For exotic formats, desktop software is the way.