SQL Schema Visualizer — View Table Structure
Parse SQL CREATE TABLE statements and render a text-based schema diagram showing columns, types, and constraints.
How it works
- 1Paste or type your text in the input field
- 2Click "Visualize Schema" — processing happens in your browser
- 3Copy the result or download as a text file
What to do next
About SQL Schema Visualizer
SQL Schema Visualizer is a developer tool that runs in your browser. Parse SQL CREATE TABLE statements and render a text-based schema diagram showing columns, types, and constraints. 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.
SQL Schema Visualizer is implemented on top of standard browser APIs. Inputs are read from the file picker or drop zone, decoded in the browser, processed, and re-encoded into the output format. Files up to 0 MB are well within the comfort zone of any modern browser.
SQL Schema Visualizer parses your file with standard browser APIs entirely inside the browser, applies the options you selected, and returns a download. The processing has no network step, which means a slow or intermittent connection does not slow down the work — once the page is loaded, only your CPU and RAM are involved.
If you fit any of these descriptions, SQL Schema Visualizer should slot cleanly into your workflow: data analysts wrangling JSON; backend developers inspecting requests; QA engineers writing repro cases. The tool keeps the controls focused on what matters for each of these use cases.
SQL Schema Visualizer is shaped for the gap between "I'll do it by hand" and "I'll script it." When the job is small enough that automating it would take longer than doing it, but annoying enough to want a focused tool — that is the situation this page is built for.
On limits: 0 MB per file is the ceiling. Output formats and quality settings are listed in the controls panel above, and they apply to every run.
Workflow tip: SQL Schema Visualizer pairs well with ERD Generator and SQL Query Formatter. Other adjacent tools you may find useful are SQL to Prisma Schema and Database Schema Comparator. Because every tool is a separate page, you can mix and match the steps that match your job. Bookmark the ones you reach for the most.
The transformation in SQL Schema Visualizer is deterministic — the same input plus the same options produces the same result every run. That predictability matters when the result has to match an upstream specification or be reproducible later.
The output handed back by SQL Schema Visualizer is the output file. If you would prefer to keep the result in the browser instead of downloading it, you can copy it from the result panel and paste it directly into another tab — useful when the next tool in your workflow expects pasted text rather than a file.
Some background on the design choices behind SQL Schema Visualizer: 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.
If you also use a command-line tool for sql schema visualizer, SQL Schema Visualizer is a convenient alternative for the times you are on a different machine or helping someone who is not comfortable in a terminal. The output is a standard file in the format documented above.
Tips from users who reach for SQL Schema Visualizer regularly: process one input first to confirm the settings produce what you expect before committing to a batch; treat the page as the working surface and avoid leaving large jobs running in a backgrounded tab where the browser may throttle JavaScript; and if a particular file fails, check whether the source is intact by opening it in its native viewer — most "tool errors" are actually input errors.
For most failure modes, refreshing the page and re-running the job is enough — the engine has no persistent state to corrupt. If the same input fails twice in a row, the input itself is most likely the problem (a truncated file, an unexpected variant of the format, or a stream the engine does not recognise).
SQL Schema Visualizer 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
- 1Reach the SQL Schema Visualizer page in your browser to begin.
- 2Drop a developer file onto the upload area, or click to pick one from your device.
- 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.
- 4Hit the run button. standard browser APIs does the work in your browser tab.
- 5Download the result. The file is generated in your browser and saved through your normal download flow.
- 6Re-run with different settings as often as you want. Each run produces a fresh output and the original file on disk is never modified.
Common use cases
- Inspect a payload during local development without writing a script using SQL Schema Visualizer.
- Format a noisy log line into something a teammate can read.
- Decode a token to confirm its claims during a debugging session.
- Convert between data formats while wiring up an integration.
- Generate a quick fixture without leaving the browser.
- Encode binary content for transport in a JSON body.
- Pretty-print a minified blob during incident triage.
- Inspect a regex against a test string before committing it.
- Generate boilerplate from a single specification line.
FAQ
What constraints are shown?
PRIMARY KEY (PK), FOREIGN KEY (FK), UNIQUE (UQ), and NOT NULL (NN) constraints are detected and displayed.
Can I visualize multiple tables?
Yes — paste multiple CREATE TABLE statements and each will be rendered as a separate box diagram.
Is this a graphical ERD?
This tool outputs text-based box diagrams. For relationship diagrams, use the ERD Generator tool.
Does it handle all SQL dialects?
It parses standard CREATE TABLE syntax. Dialect-specific extensions may be partially supported.
Is my schema private?
Yes — parsing runs entirely in your browser with no data uploads.
Can I copy the output?
Yes — the text diagram can be copied and pasted into documentation, chat, or code comments.
Do I need to install anything to use SQL Schema Visualizer?
No installation is needed. SQL Schema Visualizer 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 SQL Schema Visualizer on any computer you have temporary access to without leaving anything installed on it.
Is there a programmatic version of SQL Schema Visualizer?
SQL Schema Visualizer is a browser-only tool by design and does not expose a hosted API. The reason is the same as the privacy story: there is no Favtoo backend doing the work, so there is no service to call. If you need to script the same transformation, the underlying engine (standard browser APIs) is open-source and can be used directly from your own code.
Does SQL Schema Visualizer work in Safari, Firefox, Chrome and Edge?
SQL Schema Visualizer works in any modern browser released in the last few years — Chrome, Edge, Firefox, Safari, Brave, Arc and the major Chromium derivatives are all supported. The underlying engine relies on widely-supported web APIs, so there is nothing exotic to install. If you are on a very old browser version and the tool fails to load, updating to the latest release of your preferred browser is the only fix needed.
Why is my browser prompting me when I open SQL Schema Visualizer?
SQL Schema Visualizer only needs the standard web platform — file picker access for the inputs you choose to load, and optionally clipboard access if you copy the result rather than downloading it. There is no microphone, camera, geolocation or background-permission request, because none of those are needed for the work the tool does.
Are there any hidden fees with SQL Schema Visualizer?
SQL Schema Visualizer 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.
Does Favtoo keep a copy of files I process with SQL Schema Visualizer?
Favtoo keeps no copy of your file because Favtoo never receives your file. SQL Schema Visualizer 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 is SQL Schema Visualizer different from desktop apps that do the same thing?
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. SQL Schema Visualizer 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.