ASCII Table — Full 0–127 Reference
Display the full ASCII table (0–127) with decimal, hex, octal, and character columns including control codes.
How it works
- 1Configure your options above
- 2Click "Show Table" — processing happens in your browser
- 3Copy or download the result
What to do next
About ASCII Table Reference
ASCII Table Reference is an developer tool that runs in your browser. Display the full ASCII table (0–127) with decimal, hex, octal, and character columns including control codes. The page you are reading is the same workspace you will use to do the work: pick a file or paste your input, choose the options that matter to you, and the tool produces the result on your device.
The right moment to reach for ASCII Table Reference is when you have a focused developer utility job that fits inside a browser tab. Open the page, drop in the file or paste your input, choose the options that matter, and the tool returns the result.
The execution path is auditable from the page itself: open developer tools, switch to the Network tab, run a job. The requests you see are static-asset GETs for the engine and the page resources. The actual work is JavaScript code running against the bytes already in your tab's memory.
Behind the controls you see, standard browser APIs is doing the actual developer utility. Formats are detected on load and the engine produces a deterministic output for any given input + options combination — useful when you need to re-run a job and expect identical results.
The hard constraints are easy to remember. Maximum input: 0 MB. Multiple files per run: no — one input at a time, by design, to keep results predictable. The same controls apply on every run.
Anyone who works with developer utility on a casual basis — students learning new languages, engineers debugging API payloads, backend developers inspecting requests — finds ASCII Table Reference a quick way to get the result. The page loads in under a second, the controls are visible from a single screen, and the result downloads or copies in one click.
The download is delivered as a clearly named file the moment processing completes — no email link, no "your result will be ready in 5 minutes" queue, no expiry timer. The file is generated in your browser and saved by your browser's normal download flow.
Even on its own, ASCII Table Reference composes well with the rest of your toolkit. The output is a standard developer file that opens in any program that handles the format, so the result of one run can become the input to whatever step you use next.
ASCII Table Reference is honest about scope: it handles a single, well-defined developer utility step. Specialist edge-case work — uncommon formats, very large inputs, or pipelines that need scripting — is what dedicated desktop apps are for. This page handles the common case quickly.
Some background on the design choices behind ASCII Table Reference: every option you see on the page is there because a real workflow needs it, and every option that is not shown has been deliberately omitted to keep the common case fast. The bias is toward minimal-but-complete.
ASCII Table Reference produces deterministic output: the same input plus the same options always produces the same result. That predictability matters when the result has to match an upstream specification or be reproducible later.
Pro tip: ASCII Table Reference works just as well in a private/incognito window as in a normal one, which is occasionally useful when you want zero browser-history footprint of the job. Another tip: if the tool ever feels slow, it is almost always because the browser tab is competing for CPU with another tab — pausing or closing the heavy ones gives the engine room to work.
When something goes wrong, the cause is usually one of three things: a malformed input, a browser that is out of memory, or a corporate proxy that is interfering with the page's static assets. The first two are easy to diagnose; the third typically requires asking your IT team to allow standard browser APIs to load.
ASCII Table Reference is intentionally narrow in scope so the common case is fast and the result is predictable. If you ever need a variation it does not cover, browse the rest of the catalog — there is a good chance an adjacent tool already exists, and switching between tools is just a matter of opening another tab.
How it works
- 1Open the ASCII Table Reference workspace above. The interface is a single page, so there is nothing to navigate.
- 2Add your developer input by dropping it onto the page or browsing for it.
- 3Pick any non-default settings you need. Most users leave the defaults alone for the first run and only revisit if the result needs tuning.
- 4Click to start the job. The engine (standard browser APIs) processes the input in the page; you can watch the progress indicator until it completes.
- 5Download the result. The file is generated in your browser and saved through your normal download flow.
- 6Run additional jobs as needed. The same controls and defaults apply on every run.
Common use cases
- Generate boilerplate from a single specification line using ASCII Table Reference.
- Hash a string for a quick reproducibility check.
- Decode a token to confirm its claims during a debugging session.
- Format a noisy log line into something a teammate can read.
- Inspect a payload during local development without writing a script.
- Generate a quick fixture without leaving the browser.
- Convert between data formats while wiring up an integration.
- Pretty-print a minified blob during incident triage.
FAQ
Extended ASCII?
This shows the standard 7-bit ASCII set (0–127). Extended ASCII (128–255) varies by encoding.
Control characters?
Non-printable control characters (0–31) are shown with their standard abbreviations like NUL, SOH, etc.
Space character?
Space (code 32) is labeled as SP to make it visible in the table.
Private?
Yes — generated locally.
UTF-8 compatibility?
ASCII is a subset of UTF-8; codes 0–127 are identical in both encodings.
Copy values?
Select and copy from the text output; all formats (dec, hex, oct) are provided.
What does ASCII Table Reference do that command-line tools do not?
Desktop apps usually have more advanced features but require installation, maintenance and (often) a licence. Paid online tools are convenient but route your file through their servers and gate downloads behind accounts. ASCII Table Reference sits in between: free, instant, and private, but intentionally narrow in scope. For one-off jobs and the common developer utility operations, it is usually the lowest-friction choice; for highly specialised work, a dedicated app is still the right answer.
Do I need to install anything to use ASCII Table Reference?
No installation is needed. ASCII Table Reference runs as a normal web page, with no browser extension, no native helper, and no separate desktop client to download. That is partly a privacy choice — extensions can request broad permissions, while a regular page is sandboxed by default — and partly a convenience one: you can use ASCII Table Reference on any computer you have temporary access to without leaving anything installed on it.
How long does Favtoo retain my data after using ASCII Table Reference?
Favtoo keeps no copy of your file because Favtoo never receives your file. ASCII Table Reference runs entirely in your browser, the input is held only in your tab's memory, and closing the tab discards it. There is no opt-in cloud history, no "recent jobs" panel synced to an account, and no server-side retention to configure — the architecture simply has nowhere for your file to be stored.
How often is ASCII Table Reference updated?
ASCII Table Reference is updated whenever the underlying engine releases an improvement or a bug fix. Because the tool is delivered as a static page, every visit fetches the latest version automatically — there is no "version" to manage on your end. If a particular release ever changes default behaviour, the change is documented on Favtoo's changelog so you can confirm what shifted.
Is ASCII Table Reference really free?
ASCII Table Reference is free to use. The processing runs in your browser, which keeps the per-user cost low enough that the tool can be offered openly. The download is the same file the engine produced — you can use it for as many runs as you need.
Can I use ASCII Table Reference on iOS or Android?
ASCII Table Reference runs in any modern mobile browser — Safari, Chrome, Firefox and the in-app browsers in most messaging apps all support the underlying APIs. Performance depends on the device: a recent phone handles typical inputs nearly as fast as a laptop, while older devices may take a few seconds longer near the 0 MB ceiling. The interface lays out cleanly on small screens, so you do not need to pinch-zoom to see the controls.
Does ASCII Table Reference upload my file to a server?
Your file is processed inside your browser by standard browser APIs. The engine reads the file's bytes from your tab's memory, computes the result, and writes the result back into the tab. You can confirm what the page does by opening developer tools and watching the Network tab during a run — the requests you see are for the tool's static assets only.