Calculator
What the Add Border to Image does
Add Border to Image: paints a solid frame around the image (the canvas grows, nothing is covered), with optional inner padding and a hairline. Everything runs in your browser and the file is never uploaded.
The Add Border to Image converts the file you choose without uploading it anywhere. Everything runs on your own device, which means no waiting and no copy left on a server.
Typical users are someone converting between formats. Sending a photo to a server just to resize it is more exposure than the task deserves.
There is no account, no upload and no server round trip, because the page does the work itself.
The sections that follow cover the fields, the method, and one full example computed from the defaults.
What do the Add Border to Image fields mean?
The Add Border to Image uses 7 inputs. Each input has a default that makes sense on its own, so a partial edit still gives a valid result.
| Field | What to enter | Default |
|---|---|---|
| Image file | stays on your device | none |
| Border width | measured in px; accepts 1 to 500 | 20 |
| Border colour | optional | #ffffff |
| Inner padding (same colour) | measured in px; accepts 0 to 500 | 0 |
| Thin inner line | choose from None, Black hairline or White hairline | None |
| Export as | choose from PNG, JPEG or WebP | PNG |
| Quality % | accepts 10 to 100 | 92 |
How does the Add Border to Image work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same conversion.
Validation is deliberately strict: silently coercing a bad value is how wrong numbers get trusted.
What a typical run looks like
You provide: Image file, Border width, Border colour, Inner padding (same colour), Thin inner line, Export as and Quality %
What happens: the file is read into memory by your browser, processed locally, and offered back as a download. It is never uploaded.
You get back: a processed file plus a short status summary in the tool panel.
The tab does the processing, so speed tracks your hardware and very large files fail on memory rather than on a quota.
How to use it
- Choose your file under Image file, or drag it onto the drop area.
- Set Border width in px (1 to 500).
- Put Border colour.
- Key in Inner padding (same colour) in px (0 to 500).
- Pick a value for Thin inner line: the options are None, Black hairline or White hairline.
- Pick a value for Export as: the options are PNG, JPEG or WebP.
- Enter Quality % (10 to 100).
- Press Add Border.
- You get Status back.
- Copy Link is the quickest way to send the exact scenario to someone else.
What this tool does not do
- EXIF metadata may be dropped during processing, which is usually desirable but worth knowing.
- Re-encoding a lossy format such as JPEG always loses some detail, even at maximum quality.
- There is no audit trail: if you need one, record the inputs alongside the output.
- Results are only as good as the inputs. Check your units before reading anything into the output.
- Performance scales with your own hardware, since no server does the work.
Frequently asked questions
Enter Border width in px and Inner padding (same colour) in px. Look for the unit beside each label; the result is reported in a stated unit as well.
Border width accepts 1 to 500 px. Out-of-range entries are refused up front, which is safer than silently clamping them.
Your file stays on your machine. Nothing is transmitted, stored or queued for processing elsewhere.
Nothing at all. There is no registration, no paywall and no per-use quota.
It matches what you would get working it out by hand, with fewer opportunities to slip.