CalculatorsEMI, SIP, GST, percentages and more — instant, accurate, free.ConvertersUnit and number-base converters for everyday engineering.FormattersBeautify, validate and transform text and code.GeneratorsUUIDs, passwords and other things you need on demand.CryptographyHashes and encodings, computed locally in your browser.Data & TransformConvert JSON, CSV, YAML, XML & TOML — and generate code from JSON.CSV ToolsConvert, clean, filter, analyze and transform CSV files — all in your browser.Encoding & DecodingBase64, Base32/58/62, Hex, Octal and Punycode encoders & decoders.Text ToolsCase conversion, counting, sorting, dedupe, reverse and more.ValidatorsValidate JSON, YAML, XML, CSV, TOML and more — with clear error messages.Repair ToolsFix broken JSON, CSV, XML, YAML and other malformed data.Diff & CompareCompare two texts, JSON, CSV, YAML, XML and more — highlight the differences.QR & BarcodesGenerate WiFi, vCard, URL and other QR codes, plus Data Matrix & Aztec barcodes.MinifiersShrink JSON, CSS, JavaScript, XML and SVG by removing whitespace.BeautifiersPretty-print and indent CSS, HTML and JavaScript.Security & TokensJWT, HMAC, key pairs, TOTP, PKCE, secure tokens and password tools.Developer UtilitiesCron, regex, timestamp, URL, JSONPath, XPath, escaping and more.Format ConvertersMarkdown⇄HTML, env/INI/properties⇄JSON, NDJSON, SVG data-URI and more.Image ToolsResize, crop, convert, compress, recolor and extract palettes — all in your browser.
Learn
Blog

Find Missing Rows

Free tool to find rows that are in one CSV (A) but missing from another (B), in your browser.

Learn more: CSV Files ExplainedThe CSV format, RFC 4180 quoting rules, encodings, common pitfalls, and how CSV compares to TSV, JSON and Parquet.

CSV ACSV B

Result

Runs entirely in your browser — nothing you enter is uploaded or stored.

Ask about this tool on

Find Missing Rows

Free tool to find rows that are in one CSV (A) but missing from another (B), in your browser.

All processing happens in your browser — your files never leave the page, which you can confirm from the Network panel or our privacy policy.

Frequently asked questions

How do I use the Find Missing Rows?

Paste your two CSV files (A and B) and the result appears below. Everything runs in your browser.

Is my data uploaded anywhere?

No. This tool runs entirely in your browser — your CSV files are never sent to a server.

Is the Find Missing Rows free?

Yes — completely free, no sign-up and no limits.

Find Missing Rows

Frequently asked questions

Related tools