Parse The Data
Local only

CSV cleaner

Clean a CSV without uploading it.

Data workspace

Ready in this tab

Source

0 B Processed locally
Import settingsAuto-detect enabled
JSON text

Overrides apply on the next analysis. File decoding and every transform run only in this tab.

Paste data or choose a file to begin.

Analysis canvas

Ready when you are.

  1. Add a local file or paste data.
  2. Analyze format, quality, and likely sensitive fields.
  3. Review, clean, and export the in-tab working copy.
01 / Parse

Know the shape of the data.

Detect delimiters, validate structured text, and surface useful error locations.

02 / Review

Spot quality and privacy risks.

Measure completeness, duplicates, mixed values, and likely identifiers before sharing.

03 / Prepare

Shape a working copy locally.

Filter, sort, select, rename, deduplicate by keys, validate schemas, and export without changing the original file.

Focused utilities

Start with the job in front of you.

Every route opens the same private engine with guidance tailored to that format.

Compare + joinDiff two datasets CSV cleanerProfile + clean tables CSV filter + sortKeep and order rows CSV column selectorSelect + reorder fields Deduplicate by keysChoose record identity JSON validatorValidate + inspect records JSON repairFix + review syntax JSON path queryQuery RFC 9535 JSONPath Schema validatorTest Draft 2020-12 JSONL converterPrepare streaming data Schema generatorInfer a data contract Date formatterNormalize date columns Phone formatterE.164 + national formats Delimiter detectorFind hidden separators PII scannerCatch obvious exposure Natural VoiceEdit machine-made rhythm

Practical guide

A safer CSV cleanup workflow

CSV looks simple until quoted commas, inconsistent row widths, formula-like cells, and mixed date formats reach a spreadsheet or database. This tool parses quoted fields, detects common delimiters, and shows the quality impact before you export.

  • 01Confirm the detected delimiter and row count.
  • 02Review missing cells, duplicate rows, and mixed column types.
  • 03Apply only the cleanup actions you understand.
  • 04Export CSV with spreadsheet-formula protection enabled.
How are dangerous spreadsheet formulas handled?

CSV and TSV exports prefix formula-like text—including values beginning with ASCII or full-width equals, plus, minus, or at-sign characters—so spreadsheet software treats it as text.

Does Parse The Data upload my files?

No. Parsing, profiling, cleanup, and export run inside your browser tab. The application does not send dataset contents to our server or any third party.

What file types are supported?

CSV, TSV, JSON, and JSON Lines (JSONL or NDJSON) are supported as pasted text or local files up to 10 MB. CSV files can also be decoded as UTF-8, UTF-16, or Windows-1252.

Can it detect every privacy risk?

No. The privacy scan uses deterministic patterns and column-name hints. It can find common emails, phone numbers, IP addresses, SSNs, and payment-card patterns, but it is not a substitute for a formal privacy review.

Designed for restraint

The server delivers the tools. Your dataset stays in the browser.

The app files arrive first. Parsing, profiling, and cleanup then happen in a browser worker on your device. The dataset has no upload path.

  • No accounts
  • No cloud storage
  • No third-party scripts

Use the PII scan as an early warning—not as legal advice or a compliance certification.