Polish images without uploading them.

Files are read from your disk with the browser file API, decoded into an in-memory bitmap, and drawn onto an HTML canvas. Every edit — a resize, a crop, a rotation, a watermark — is a drawing operation applied to that canvas in sequence, and the export step encodes the finished canvas as the output format you chose. Because the whole pipeline runs in your browser tab, no file ever travels over the network, and the speed of each batch depends on your device rather than a server queue.

The live preview shows the actual encoded output rather than a rough approximation: compression quality, target file size, and dimension changes are reflected before you commit to a download, so what you see is what lands in your folder. Settings only appear when they apply — you will not see AVIF quality options while exporting PNG, and target-size controls stay hidden for formats that do not compress lossily.

PNG is the choice when pixels must survive exactly: screenshots, diagrams, logos, and any image with crisp text or transparency. It compresses losslessly, so re-encoding never softens detail, but files run larger than lossy formats at the same visual complexity. JPEG suits photographs and scanned documents — visually rich images where the encoder can discard imperceptible detail to cut file size dramatically, with quality 82–88 usually the sweet spot.

WEBP gives you both behaviors in a single format and typically lands 25–35% smaller than JPEG at equivalent quality, making it the default recommendation for web images. AVIF compresses even further with excellent quality, though it renders slower on low-end devices — best for hero images rather than long galleries. BMP and TIFF preserve raw pixels for print and archival workflows, ICO exists purely for favicons, and PDF export wraps images into A4 or Letter pages for printing or document bundles.

Start with dimensions rather than quality. Most images ship to the web far larger than the space they occupy on screen — a 4000-pixel-wide photo displayed in a 600-pixel column is carrying more than six times the data it needs. Resize to the actual display size first; this alone often removes 70–90% of the file size with zero quality loss on the rendered result.

Then apply quality compression. Target-size mode is the fastest path when you have a hard limit — an upload form demanding 100 KB, an email with attachment caps — because it iteratively adjusts encoder quality until the output fits the number you set. For galleries and article images, fixed quality around 82–85 is more consistent frame-to-frame. Skip compression entirely for images that will be edited again later: every lossy round trip compounds, so keep masters in PNG or TIFF and export compressed derivatives only at the point of delivery.