File

Convert CSV to JSON and JSON back to CSV, with a delimiter option.

Open an .xlsx workbook in the browser and export any sheet as CSV, JSON or a Markdown table — the file never leaves your device.

Turn CSV or TSV into a real .xlsx file in your browser, with leading zeros, long IDs and codes like SEPT1 kept exactly as typed.

Compute SHA-1, SHA-256, and SHA-512 checksums of any file.

Open text files in legacy encodings (EUC-KR, Shift_JIS, Windows-1252…) as readable UTF-8.

Split a large file into smaller chunks to bypass attachment or upload size limits.

Drop a ZIP and see every file inside — sizes, contents, and per-file download — without unpacking it locally.

Open an .epub in your browser: metadata, chapter list with word counts, the plain text, and the structure checks that explain why a reader rejects a book.

Combine multiple JPG / PNG images into a single PDF with adjustable page size, orientation, and fit.

Split a large CSV into smaller chunks by row count — repeat the header on each chunk, download all at once.

Convert PNG/JPG to WebP (or back) with an adjustable quality slider — runs in your browser via canvas.

Generate 10 favicon PNG sizes (16, 32, 48, 64, 96, 128, 180, 192, 256, 512) from one source image — copy the HTML snippet.

Drop a few files into the browser and download them as a single .zip — no upload, no install, fast compression.

Drop two or more PDFs, reorder them with the arrow buttons, and download a single merged PDF — all in your browser, no upload.

Shrink a PDF by re-encoding the images inside it. Text stays selectable and searchable. Nothing is uploaded.

Cut a clip out of an audio file by dragging across its waveform, add fades, and download it as a WAV. Nothing is uploaded.

See every page of a PDF as a thumbnail, then reorder, rotate or delete pages and save the result. Nothing is uploaded.

Pull the text out of a PDF and copy it or save it as a .txt file — whole document or selected pages. Nothing is uploaded.

Turn each page of a PDF into a PNG, JPEG or WebP image at the resolution you choose, then download them one by one or as a ZIP. Nothing is uploaded.

Number the pages of a PDF — position, style, starting number and whether to skip the cover — and download it. Nothing is uploaded.

Stamp text like DRAFT or CONFIDENTIAL across a PDF — size, colour, opacity and angle you choose — and download it. Nothing is uploaded.

Turn a sideways or upside-down PDF the right way up — every page or just the ones you pick — and download it. Nothing is uploaded.

Drop a PDF and pull just the pages you want — `1-3, 5, 7-10` — into a fresh PDF. All in your browser, no upload.

Drop a file and paste an expected SHA-1 / 256 / 384 / 512 — see if the actual hash matches. Useful before installing downloaded binaries.

Drop a CSV, see row / column counts, per-column type inference, null counts, unique counts, and full-row duplicate detection — all locally.

Convert between LF, CRLF, and CR line endings and add or remove a UTF-8 BOM — with per-style counts so you can see how mixed the input was.

Drop a file to identify its true format from its magic bytes — and catch files whose extension or declared MIME type lies.

Drop files and preview a batch rename — pattern with {n}, {name}, {ext}, {date}, plus find/replace, case modes, and collision detection.

Paste CSV/TSV, click the columns you want, get them back as plain lines, CSV, quoted-comma-separated, or a ready-made SQL IN-clause.

Drop an `.eml` file and read the parsed message — key headers, plain-text and HTML body parts, and a list of attachments — all in the browser.

Convert subtitle files between SRT (SubRip) and WebVTT — auto-detects the input format, fixes timestamp punctuation, optionally strips VTT styling tags.

Paste or drop a `.jsonl` / `.ndjson` file, see records as a table, filter by `field:value`, pick which columns to keep, and re-export as JSON or CSV.

Paste or drop a Markdown file, extract the YAML / TOML / JSON frontmatter into a JSON object, and see the body separately with word and char counts.

Drop a `.png` file and see every chunk it contains — IHDR, IDAT, tEXt metadata, IEND — with sizes, CRCs, and the critical/ancillary/safe-to-copy flags.

Upload any text file and detect its encoding — UTF-8, UTF-16 LE/BE, UTF-32, Latin-1, ASCII — with BOM detection, byte signal analysis, and a hex preview.

Parse a .env / dotenv file with full support for single-quoted, double-quoted, multi-line, and inline-comment values. Export as JSON, YAML, shell exports, Dockerfile ENV, or Netlify TOML.

Generate a downloadable .ics calendar event with title, start/end, location, attendees, recurrence (daily/weekly/monthly/yearly) and a reminder — fully RFC 5545 compliant, generated in your browser.

Open an .ics invite or calendar export and read what is actually in it — every field, plus the real dates a repeating rule produces.

Drop a .gpx file from your GPS watch, Strava, Garmin, Wahoo, Komoot or any GPS tracker and instantly see distance, elevation gain/loss, duration, moving time, average and max speed, plus an in-browser track map and elevation profile.

Drop a .stl file (binary or ASCII) and instantly see triangle count, bounding box, X×Y×Z size, volume, surface area, watertight check, three orthographic preview projections, and whether it fits common 3D-printer beds (Bambu, Prusa, Voron, Ender).

Paste or upload a GeoJSON file and get a structural validation against RFC 7946, per-geometry counts, WGS-84 spherical-excess area for polygons, haversine length for linestrings, bounding box, and an SVG map preview — all in your browser with no upload.

Drop or paste any vCard 2.1, 3.0, or 4.0 .vcf export and read all the contacts as cards — names, phone numbers, emails, addresses, organizations, URLs, birthdays, notes, embedded photos, and any custom X- fields, all parsed locally in your browser.

Drop any bencoded file (.torrent or raw bencode) and inspect its tree, info hash (SHA-1), trackers, file list, piece length, and creation metadata — all parsed locally in your browser.

Drop a .har file from Chrome / Firefox / Safari DevTools and instantly see every request — method, status, size, time, content type — with stats, slowest/largest tables, and filterable / sortable entries. Runs entirely in your browser.

Drop a .wav file and read its format, channels, sample rate, bit depth, duration, all RIFF chunks, and embedded LIST/INFO tags — fully client-side.

Drop an MP3 and read its ID3 tags, bitrate and duration, and pull out the embedded cover art — all in your browser.

Open an Apple property list — binary or XML — and read it as a tree, or convert it to JSON or XML plist.