Private by default
Decode and encode inside your browser session. We do not ingest your images into a backend queue, and there is no account wall between you and the tool.
Browser-local · No upload queue
Image conversion that never leaves your tab
Convertissima turns JPG, PNG, WebP, ICO, GIF, SVG and supported AVIF into the format you need—without shipping your files to a remote server. You stay in control: pick formats, tune quality and size, run a predictable queue, and download results one by one.
Built for real workflows
Three principles we refuse to compromise on: privacy, clarity, and speed. No dashboards you do not need—just the job done.
Sharp, focused UI
Drop files or paste a URL, choose an output format, adjust quality or max dimensions when it matters, then convert. Progress stays visible so you always know what is happening.
Formats people actually ship
JPG and PNG for compatibility, WebP and AVIF when the browser allows, GIF for lightweight motion, ICO for icons, and SVG as a raster wrapper when you need a vector container without tracing artwork.
How it works
From first file to download in three deliberate steps. If a remote URL is blocked by CORS, save the asset locally and drop it in—your browser, not ours, enforces that boundary.
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Step 1
Bring your input
Drag and drop one or many images, use the file picker, or fetch from a URL when the host permits cross-origin reads.
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Step 2
Choose output and settings
Select the target format, dial in quality, cap width and height, set a background for opaque exports, and pick how ICO assets should fit inside the square.
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Step 3
Convert and download
Run the queue, watch the progress bar advance per file, then download each finished result. Large batches stay responsive because work is serialized on purpose.
Ready when you are
The Convertissima image converter is live. Open it now and turn JPG, PNG, WebP, ICO, AVIF, GIF or SVG into the format you need.
Launch the converter