1Upload the ICO icons you want to work on; the file opens in an editable view in your browser with nothing installed.
2Make your changes — crop, rotate, resize, draw and recolour on an image; rewrite the words and restyle headings, lists and tables in a document — and every one of them lands on a working copy, never on your upload.
3Preview the result at full size before you commit to it.
4Export back to ICO, or to a format that re-compresses nothing if you are still part-way through editing.
ICO Editor FAQ
Anything specific to ICO in the editor?
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Yes — an ICO is a stack of square bitmaps, not one image, so operations apply to the stack and Windows still picks whichever size it wants. Worth knowing before you export over your only copy.
Is my file uploaded, or does editing happen locally?
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Editing happens in your browser; the file goes to our workers only for the operations that genuinely need server-side processing, and it is deleted shortly afterwards.
How does ICO Editor let me edit without installing anything?
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Concretely, the largest bitmap in the stack is the one you edit, and the smaller sizes are regenerated from your edited version at export rather than left showing the old artwork. The editing surface is the browser, so there is nothing to install and no licence to hold.
What can I actually change?
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Whatever the format itself can carry. On an image that is crop, rotate, flip, resize, drawing, text and shapes, filters and colour; in a document it is the wording, the headings, the lists and the tables. Everything is applied to a working copy, so the file you uploaded is never modified in place.
Does ICO Editor cost anything?
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No. ICO Editor is free with no account, and the output carries no watermark — which matters more here than anywhere else, since an icon is a handful of pixels with nowhere to hide one.
What can I upload to ICO Editor?
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ICO files containing one or several sizes, plus ordinary PNG or JPG artwork if you are building an icon rather than editing one. Windows .ico and browser favicon files are the same format.
Is there a file size limit on ICO Editor?
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Yes: free accounts process images up to 5 MB each, which no icon file will ever approach — a full 16-to-256-pixel stack is typically well under 200 KB. Icons are the one part of the image family where the cap is genuinely irrelevant.
Which sizes should the icon contain?
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16, 32 and 48 pixels cover Windows Explorer and browser tabs; 256 covers large-icon view and modern shortcuts. Keeping all of them in one file costs almost nothing and stops the operating system from having to guess.
Why does a MP3 site host ICO Editor?
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MP3.to is built around the format that made portable audio ordinary: universally playable, small enough to ignore, and lossy in a way that only matters if you keep re-encoding it. Audio jobs cluster: the same person who needs a format changed usually needs the file cut, levelled or made smaller in the same sitting. Putting ICO Editor behind the same upload, the same caps and the same account is what turns three tabs into one.
What should I do with the result once ICO Editor is finished?
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The converter on this site moves audio between MP3, WAV, FLAC, M4A, OGG and Opus, so the output format is a decision you can leave until the end rather than commit to at the start. Doing that after ICO Editor rather than before means the encode happens once, on the file you actually settled on, instead of twice.
Is ICO Editor here the same tool the sibling sites run?
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The engines are shared — the same ffmpeg build, the same workers, the same limits. What a MP3 site adds is a point of view about bitrates, about what survives an encode and about when a lossless intermediate is worth the upload time. It also starts from one fact about the format this site is named after: MP3 frames are fixed-size blocks, so a cut lands on a frame boundary and gapless playback markers do not survive a re-encode.
Do I need an account, and does anything get kept?
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No account, and nothing is kept: uploads are deleted from the workers shortly after the job finishes, nothing is listened to and nothing is indexed. Free accounts exist for history and batch size, not for access.
