Category
File
Inspect and transform files locally: compute checksums to verify a download, detect a file's real type from its magic bytes, convert between CSV and JSON, merge PDFs or extract pages, and more. Files are read with the browser's FileReader API and never uploaded, which makes these tools safe for contracts, exports and anything confidential.
CSV ↔ JSON Converter
Convert CSV to JSON and JSON back to CSV, with a delimiter option.
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Excel (XLSX) to CSV, JSON & Markdown
Open an .xlsx workbook in the browser and export any sheet as CSV, JSON or a Markdown table — the file never leaves your device.
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CSV to Excel (XLSX) Converter
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.
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File Hash (Checksum)
Compute SHA-1, SHA-256, and SHA-512 checksums of any file.
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Image → PDF Converter
Combine multiple JPG / PNG images into a single PDF with adjustable page size, orientation, and fit.
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Image → WebP / JPEG / PNG Converter
Convert PNG/JPG to WebP (or back) with an adjustable quality slider — runs in your browser via canvas.
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Favicon Generator (multi-size PNG)
Generate 10 favicon PNG sizes (16, 32, 48, 64, 96, 128, 180, 192, 256, 512) from one source image — copy the HTML snippet.
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Mic Test & Voice Recorder
Check that your microphone works, watch the input level and waveform live, and record a clip. The audio never leaves your device.
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PDF Merger
Drop two or more PDFs, reorder them with the arrow buttons, and download a single merged PDF — all in your browser, no upload.
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PDF Compressor
Shrink a PDF by re-encoding the images inside it. Text stays selectable and searchable. Nothing is uploaded.
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Audio Trimmer
Cut a clip out of an audio file by dragging across its waveform, add fades, and download it as a WAV. Nothing is uploaded.
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PDF Page Organizer
See every page of a PDF as a thumbnail, then reorder, rotate or delete pages and save the result. Nothing is uploaded.
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PDF to Text Extractor
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.
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PDF to Image Converter
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.
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Add Page Numbers to a PDF
Number the pages of a PDF — position, style, starting number and whether to skip the cover — and download it. Nothing is uploaded.
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Add a Watermark to a PDF
Stamp text like DRAFT or CONFIDENTIAL across a PDF — size, colour, opacity and angle you choose — and download it. Nothing is uploaded.
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Rotate PDF Pages
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.
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PDF Page Extractor
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.
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Specialized tools58
Tools for narrower, more technical jobs: particular file formats, standards and professional fields. They work like every other tool here, entirely in your browser.
Text Encoding Converter
Open text files in legacy encodings (EUC-KR, Shift_JIS, Windows-1252…) as readable UTF-8.
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File Splitter
Split a large file into smaller chunks to bypass attachment or upload size limits.
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ZIP Inspector
Drop a ZIP and see every file inside — sizes, contents, and per-file download — without unpacking it locally.
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EPUB Viewer, Metadata & Text Extractor
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.
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CSV Splitter (by rows)
Split a large CSV into smaller chunks by row count — repeat the header on each chunk, download all at once.
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HEIC to JPG Converter
Convert iPhone HEIC photos to JPG or PNG in your browser, many at once. The photos are never uploaded, and location data is not carried over.
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WebP File Inspector
Walk a .webp file’s RIFF chunks in your browser: lossy, lossless or extended, canvas versus frame size, animation timing, alpha, ICC, Exif and XMP.
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ICO / CUR Inspector
Open a Windows .ico or .cur in your browser: every size inside it, PNG or BMP payloads, hotspots, the AND mask, and any broken entry.
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TIFF Structure Inspector
Open a .tif in your browser: byte order, the IFD chain and its pages, every directory entry, and whether the pixels sit in strips or in tiles.
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PSD / PSB Inspector
Read a Photoshop .psd or .psb without Photoshop: canvas, colour mode, every layer with its blend, opacity, mask and group, plus the thumbnail.
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DDS Texture Inspector
Open a .dds texture in the browser: header flags, BC1–BC7 pixel format, the mip chain with sizes and offsets, cube faces, and a decoded preview.
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BMP / DIB Inspector
Open a .bmp or .dib in your browser: header version, bit depth, row order, compression, colour masks, palette, and where every byte of the file goes.
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TAR Inspector
Open a .tar, .tar.gz or .tgz and list every entry — permissions, owner, size, timestamp and link target — without extracting it.
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Font File Inspector
Open a .ttf, .otf or .woff and read its real family name, glyph and character counts, version, licence text and embedding permissions.
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Mach-O Binary Inspector
Open a macOS or iOS binary in your browser: the architectures inside a universal file, segments and sections, linked dylibs, rpaths, UUID and signing.
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MP4 / ISO Base Media File Inspector
Open an MP4, M4A, M4V or MOV in your browser: brands, the fast-start check, the whole box tree, every track codec and duration, and iTunes tags.
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Java Class File Inspector
Read a compiled .class file in the browser: class file version and JDK release, access flags, constant pool, fields, methods and referenced classes.
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PE Inspector: Windows EXE and DLL Viewer
Open a Windows .exe, .dll, .sys or .efi in your browser: architecture, subsystem, imports, exports, sections, and whether ASLR, DEP and CFG are on.
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ELF Binary Inspector
Open a Linux executable, .so or .o in your browser: architecture, shared libraries it needs, build ID, and whether it is PIE, NX and RELRO hardened.
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Git Packfile Inspector (.pack / .idx)
Read a .pack and .idx pair in the browser: every object with its type, size, offset, delta depth and base, totals by type and the biggest objects.
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Git Index Inspector
Read .git/index in your browser: every staged entry with its blob hash, mode and flags, conflict stages, extensions and the trailing checksum.
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ICC Colour Profile Inspector
Open an .icc or .icm file and read its header, tag table, primaries, white point and tone curves. Everything is decoded in your browser.
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SQLite Database Inspector
Open a .sqlite or .db file in your browser and read its structure: page size, encoding, journal mode, and every table with its real row count.
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Subtitle Time Shifter
Paste an SRT or WebVTT file, type an offset in seconds, and get every cue shifted forward or backward.
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ZIP Builder
Drop a few files into the browser and download them as a single .zip — no upload, no install, fast compression.
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Video to MP3 — Extract Audio from Video
Pull the sound track out of an MP4, WebM or MOV video and save it as MP3 or WAV, right in your browser. Nothing is uploaded.
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Audio Joiner — Merge MP3 and Audio Files
Join several songs, voice notes or sound clips into one MP3 or WAV in your browser, with an optional gap or crossfade between them. Nothing is uploaded.
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Sign a PDF Online
Draw, type or upload your signature, place it on any page of a PDF, and download the signed file. Runs in your browser; nothing is uploaded.
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File Hash Verifier
Drop a file and paste an expected SHA-1 / 256 / 384 / 512 — see if the actual hash matches. Useful before installing downloaded binaries.
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CSV Inspector
Drop a CSV, see row / column counts, per-column type inference, null counts, unique counts, and full-row duplicate detection — all locally.
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Line Endings & BOM Converter
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.
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File Type Detector (Magic Bytes)
Drop a file to identify its true format from its magic bytes — and catch files whose extension or declared MIME type lies.
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Bulk File Renamer Preview
Drop files and preview a batch rename — pattern with {n}, {name}, {ext}, {date}, plus find/replace, case modes, and collision detection.
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CSV Column Extractor
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.
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EML File Viewer
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.
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Mbox Archive Viewer
Split a .mbox archive in your browser: message boundaries, decoded headers, MIME structure, threads and duplicate Message-IDs. Nothing is uploaded.
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SRT ↔ VTT Subtitle Converter
Convert subtitle files between SRT (SubRip) and WebVTT — auto-detects the input format, fixes timestamp punctuation, optionally strips VTT styling tags.
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JSON Lines (NDJSON) Viewer
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.
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Markdown Frontmatter Parser
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.
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PNG Chunk Inspector
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.
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File Encoding Detector
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.
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.env File Parser
Parse a .env / dotenv file with full support for single-quoted, double-quoted, multi-line, and inline-comment values.
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ICS (iCalendar) Event Builder
Generate a downloadable .ics calendar event with title, start/end, location, attendees, recurrence and a reminder — fully RFC 5545 compliant.
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ICS Calendar Viewer & Recurrence Expander
Open an .ics invite or calendar export and read what is actually in it — every field, plus the real dates a repeating rule produces.
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GPX Track Inspector (Distance, Elevation, Map)
Drop a .gpx from your GPS watch, Strava, Garmin or Komoot and see distance, elevation gain, moving time and speed, with a map and elevation profile.
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STL 3D Model Inspector (Volume, Bed Fit)
Drop a .stl file and see triangle count, bounding box, size, volume, surface area, a watertight check, and whether it fits common 3D-printer beds.
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GeoJSON Inspector & Validator (RFC 7946)
Paste or upload GeoJSON and get RFC 7946 validation, per-geometry counts, WGS-84 polygon area, haversine length, bounding box and an SVG preview.
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vCard (.vcf) File Parser & Inspector
Drop or paste any vCard 2.1, 3.0 or 4.0 .vcf export and read every contact as a card — names, phones, emails, addresses, photos and custom X- fields.
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Bencode / .torrent Inspector
Drop a .torrent or raw bencode file and inspect its tree, info hash (SHA-1), trackers, file list and piece length — parsed locally in your browser.
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HAR File Inspector (HTTP Archive Viewer)
Drop a .har file from Chrome, Firefox or Safari DevTools and see every request — method, status, size, time — with slowest and largest tables.
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WAV File Inspector
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.
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FLAC Metadata Inspector
Open a .flac in your browser: STREAMINFO, every metadata block with its offset, repeated Vorbis comments, embedded art and the real compression ratio.
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Ogg Container Inspector
Walk an .ogg, .oga or .opus page by page: granule positions, segment tables, CRC32 checks, and the logical streams the container carries.
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Gettext .mo Catalogue Inspector
Read a compiled GNU gettext .mo catalogue in your browser: byte order, header, every msgid and translation, contexts, plural forms and untranslated strings.
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gzip (.gz) Inspector
Read a .gz header field by field, walk every member, and verify the trailer by recomputing CRC32 and the real size in your browser.
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xz (.xz) Stream Inspector
Read an .xz container: stream header, every block header and filter chain, the index and the footer — with the true uncompressed size, unpacking nothing.
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MP3 Tag (ID3) Viewer & Cover Art Extractor
Drop an MP3 and read its ID3 tags, bitrate and duration, and pull out the embedded cover art — all in your browser.
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Plist Viewer (binary & XML)
Open an Apple property list — binary or XML — and read it as a tree, or convert it to JSON or XML plist.
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