345 free online tools
Find a tool by task, format, or name. Check its example and limits before working with PDFs, images, text, or data in your browser.
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SSH public-key fingerprint
Calculate a SHA256 fingerprint from an OpenSSH RSA or Ed25519 public-key blob and validate its wire structure.
File checksum manifests
Generate SHA256SUMS for a batch or verify selected files against a manifest, reporting missing, changed and unlisted files.
Flatten PDF form fields
Bake supported AcroForm appearances into page content so ordinary form controls are no longer editable.
PDF form inspection and filling
List AcroForm field names, types and options, then fill supported fields using an explicit JSON mapping.
PDF page overlay
Overlay visible page artwork from a one-page PDF or a matching page set onto a base PDF.
Subtitle conversion and timing
Convert plain SRT and WebVTT cues and shift their timing with millisecond precision for a changed video lead-in.
IPv4 CIDR set subtraction
Subtract excluded networks from an IPv4 allocation and save the exact remaining CIDR blocks.
Nmap XML open-port report
Turn a saved Nmap XML scan into an Excel workbook and CSV of host addresses and open ports.
INI and JSON converter
Move single-line INI configuration to a structured JSON document, or rebuild INI from string values.
Java Properties and JSON converter
Decode Java .properties escapes and continuations, or export a string-valued JSON map as an ASCII properties file.
HTML table and CSV converter
Extract a selected static HTML table as CSV, or build a safe HTML table from CSV cells.
CSV field constraint checker
Check CSV fields against local column rules and download valid records, rejected records and a cell-level issue report.
PDF bookmark workspace
Inspect PDF bookmarks, replace them using titles and page numbers, or clear the active bookmark tree.
Remove PDF review annotations
Remove supported review comments and markups while preserving hyperlinks, form widgets and page content.
Extract PDF attachments
Recover embedded files from PDF attachment structures and download their original decoded payloads with a filename map.
Fixed-width and CSV converter
Split fixed-width records by explicit Unicode code-point widths, or pad CSV fields into a fixed-width text file.
XLSX formula inventory
List ordinary formulas across workbook sheets with cell addresses, visibility and raw cached values, without recalculating.
JSON structure redactor
Replace all JSON scalar values or explicit object keys with a mask while retaining the document structure and a value-free path report.
Exact unified diff applier
Apply one text-file unified diff at its declared lines with exact context and explicit line-ending handling.
Markdown frontmatter extractor
Separate supported JSON or YAML frontmatter from Markdown and verify that the remaining body bytes stay unchanged.
EditorConfig path inspector
Resolve declared properties for explicit paths under one EditorConfig file and trace section order, overrides and unset.
npm lock declared-copy inventory
Inspect package-lock v2/v3 installation declarations and separate repeated names, aliases, links, workspaces and unknown versions.
CSV to SQL DDL draft
Draft a quoted CREATE TABLE statement from CSV headers and review sample-based type suggestions without executing SQL.
Subtitle quality report
Find fast, crowded or overlapping subtitle cues using your own readable-text rules.