How does the Mock CSV Data Generator work?

Define columns by giving each a name and a type (string, number, date, boolean, email, phone, first name, last name, full name, address, city, state, country, zip, company, uuid, url, paragraph, hex color, ipv4, ipv6, enum, regex, or custom constant). Choose a row count, delimiter (comma, semicolon, tab, pipe, custom), header on/off, quoting policy (always / minimal / none), line endings (LF / CRLF), and an optional BOM. The tool produces strict RFC 4180-compliant output that round-trips cleanly through any compliant parser.

Is the generated data reproducible?

Yes. The tool uses a deterministic, seedable mulberry32 PRNG. Enter the same seed and you get the identical dataset every time — useful for golden-file CI checks or sharing test fixtures. Switch the seed (or leave it blank for time-based) to get a fresh dataset for the same schema.

What column types are supported?

20+ faker types: string, number (with min/max), boolean, date (past/future/recent/iso), email, phone, first_name, last_name, full_name, username, street, city, state, country, zip, company, job_title, sentence, paragraph, url, uuid, ipv4, ipv6, hex_color, timestamp, age, money, enum (with weighted values), regex (with pattern), and constant. Each type produces type-appropriate realistic values. You can also infer column types from a pasted header row.

Are my schemas or example data uploaded anywhere?

No. Column definitions are processed entirely in your browser. Nothing is sent to a server. History (last 20 generations) is stored in localStorage on this device only, and the shareable URL encodes options in the fragment (after #) which browsers never transmit.

What extras does this tool offer versus Mockaroo and generatedata.com?

(1) Unlimited rows (no 1,000-row free cap). (2) Fully offline — your schema never leaves the browser. (3) Strict RFC 4180 escaping for embedded delimiters/quotes/newlines. (4) 4 delimiter presets + custom char. (5) 3 quoting policies (always / minimal / none). (6) LF vs CRLF line endings. (7) Excel-friendly BOM toggle. (8) 20+ faker types. (9) Weighted ENUMs. (10) Regex-pattern column. (11) Infer columns from pasted header row. (12) Blank % per column. (13) Unique constraint enforcement (collision-safe). (14) Deterministic mulberry32 seed. (15) CSV / TSV / JSON output. (16) localStorage history (max 20). (17) Shareable-URL config. (18) Copy / download .csv / .tsv / .json.

Developer Runs in your browser

Mock CSV Data Generator

Generate realistic mock CSV datasets — define columns with types (string, number, date, boolean, email, phone, name, address, uuid, url, custom), choose row count, delimiter (comma/semicolon/tab/pipe), header toggle, quoting policy, line endings (LF/CRLF), BOM toggle, infer columns from pasted header, seedable for reproducibility. Export as CSV/TSV/JSON. Unlimited rows, 100% client-side, no row caps, strict RFC 4180.

100% Private Works Offline Instant

Generated data is synthetic and reproducible from the seed. Names, emails, addresses, and phone numbers are randomly assembled from word banks and do not correspond to real people. Do not use generated email addresses or phone numbers to contact anyone.

Quick start

Infer columns from pasted header row

Columns (7)

minmaxscaleblank%unique

blank%unique

minmaxblank%unique

blank%unique

Output options

Row count

Format

Delimiter

Quoting

Line endings

Seed (optional)

Header rowUTF-8 BOM (Excel)

Generated 10 rows × 7 columns (0.8 KB)

Rows

Columns

Unique cols

Blank cols

Preview (first 20 rows)

10 / 10 shown

id	first_name	last_name	email	age	country	created_at
22330	Tyler	Howard	larryhall324@mock.net	49	Portugal	2017-08-17T17:30:47.829Z
542031	Rachel	Ruiz	cbailey@sample.io	88	India	2023-08-05T11:07:18.415Z
816972	Margaret	Reyes	amorgan@example.tech	55	United States	2024-08-05T22:23:10.769Z
233893	Ruth	Rogers	ptaylor@example.tech	60	Finland	2016-11-21T18:55:34.776Z
203797	Jonathan	Davis	scott.martinez@test.app	33	Japan	2018-12-18T09:56:36.832Z
665553	Paul	Williams	george.phillips@demo.org	31	Denmark	2019-01-09T06:29:44.277Z
165097	Debra	Martin	maria.lee@sample.co	42	United Arab Emirates	2025-01-13T07:15:51.092Z
280469	David	Roberts	thomas_kim@example.io	70	France	2019-09-29T02:37:28.101Z
519382	Jacob	James	rmoore@demo.org	26	Sweden	2020-04-03T06:25:57.388Z
801879	Deborah	Wright	laura_brooks@example.app	47	Poland	2021-08-09T23:46:57.396Z

Output (843 bytes)

id,first_name,last_name,email,age,country,created_at
22330,Tyler,Howard,larryhall324@mock.net,49,Portugal,2017-08-17T17:30:47.829Z
542031,Rachel,Ruiz,cbailey@sample.io,88,India,2023-08-05T11:07:18.415Z
816972,Margaret,Reyes,amorgan@example.tech,55,United States,2024-08-05T22:23:10.769Z
233893,Ruth,Rogers,ptaylor@example.tech,60,Finland,2016-11-21T18:55:34.776Z
203797,Jonathan,Davis,scott.martinez@test.app,33,Japan,2018-12-18T09:56:36.832Z
665553,Paul,Williams,george.phillips@demo.org,31,Denmark,2019-01-09T06:29:44.277Z
165097,Debra,Martin,maria.lee@sample.co,42,United Arab Emirates,2025-01-13T07:15:51.092Z
280469,David,Roberts,thomas_kim@example.io,70,France,2019-09-29T02:37:28.101Z
519382,Jacob,James,rmoore@demo.org,26,Sweden,2020-04-03T06:25:57.388Z
801879,Deborah,Wright,laura_brooks@example.app,47,Poland,2021-08-09T23:46:57.396Z

Privacy: All generation runs locally. History stores metadata only (not the data itself) in localStorage on this device.

How to use

Enter your input in the tool above.
Adjust any options to your preference.
Use the Copy or Download buttons to save the result.
Everything happens locally — your data never leaves your browser.

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