Printf Text
Format each line of text with a printf/sprintf format string. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Printf Text
- 1. Paste the values to format. Paste your data, one record per line, into the input pane, such as space-separated fields you want reshaped into a consistent formatted line.
- 2. Write the format string. Enter a printf/sprintf-style pattern into Format string, using placeholders to control how each line's fields are arranged, padded and labeled in the output.
- 3. Copy the formatted lines. Copy the formatted output from the output pane and paste it into a report, log or config file where consistent per-line formatting matters.
When to use Printf Text
Printf Text formats each line of your text using a printf-style or sprintf-style format string, the way you would in C, Python or a shell script. Reach for Printf Text when raw fields need to become labeled, padded or aligned output line by line.
- Turning raw fields into a labeled report line. You have plain key-value pairs on each line and want them reformatted as 'name = value' pairs for a readable report, without editing every line by hand.
- Padding values for a fixed-width log format. A legacy log parser expects each field padded to a fixed width, and applying a format string across every line produces that alignment consistently.
- Prototyping output before writing the real script. Before committing to a format string in actual code, testing it against sample data here confirms the pattern produces exactly the layout you want.
Examples
Label each row
Input
name Ada age 36
Output
name = Ada age = 36
About the Printf Text tool
Printf Text does its work locally, right in the browser. Format each line of text with a printf/sprintf format string. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Text Tools collection on EditSafely, a set of 211 small, focused Text utilities that share the same instant, private workspace.
You can shape the output with the Format string setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Does Printf Text cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.