Convert dates and identifiers
Translate Unix timestamps, ISO strings, UUIDs, and short operational values into formats that are easier to read and copy.
AppHelp category hub
Data Conversion Tools for Time, Tables, Query Strings, and Files
Utilities for converting timestamps, tabular data, query strings, JSON, CSV, Markdown tables, PDFs, and small structured payloads locally.
Quick answer
AppHelp data tools help convert between common operational formats such as timestamps, query strings, JSON, CSV, Markdown tables, PDFs, and text-friendly encodings without requiring accounts or uploads by default.
Workflows
Choose the right data tool
Move between table formats
Turn CSV, JSON, and Markdown table content into reviewable formats for docs, specs, and lightweight data cleanup.
Prepare local document outputs
Use PDF and document utilities when small file workflows need browser-local processing and downloadable results.
Tool list
Data tools on AppHelp
Every listed tool opens on its own canonical AppHelp subdomain and runs in the browser with no upload by default.
Base64 Encoder and Decoder
Encode Unicode text as UTF-8 Base64 or decode standard Base64 to text locally. Compare examples, switch modes and copy the result.
Base64 represents bytes as text; it is not encryption. This tool encodes text using UTF-8 and decodes standard Base64 bytes using UTF-8. Anyone with the encoded value can decode it.
base64encodedecodetext
Timestamp Converter
Translate Unix timestamps, ISO strings, and local dates.
Designed for event timestamps, date inputs, time zone checks, and product copy that needs precise dates.
timeunixisotimezone
Discord Timestamp Generator
Create Discord timestamp codes in all nine documented styles with local previews.
Plan timezone-friendly events, reverse existing codes, and copy ready-to-send messages without a Discord bot or login.
discordtimestamptimezoneevent
JSON to YAML Converter
Convert between JSON and YAML with adjustable indentation locally.
Handy for config files, CI pipelines, and Kubernetes manifests with two-way conversion and no upload.
jsonyamlconfigconvert
JSON to CSV Converter
Convert JSON arrays to CSV and CSV back to JSON locally.
Useful for spreadsheets, data exports, and flattening nested objects with selectable delimiters.
jsoncsvconvertdata
JSON Diff
Compare two JSON documents and list added, removed, and changed keys.
Use it for API response diffs, config reviews, and snapshot comparisons with a path-based summary.
jsondiffcomparedata
Markdown to HTML Converter
Convert Markdown to HTML and HTML back to Markdown locally.
Handy for docs, README files, CMS content, and email with a live preview and clean round-trip.
markdownhtmlconvertpreview
PDF Merger
Merge multiple PDF files locally with drag-and-drop ordering.
Built as a free browser-local AppHelp utility with copy or download output and no account requirement.
pdfmergedocument
PDF Splitter
Split a PDF into page ranges locally in your browser and download the extracted results as a ZIP.
PDF Splitter extracts selected page ranges from a PDF in your browser and downloads the results as a ZIP. Enter single pages or ranges such as 1-3,5, process locally, and keep the original document on your device by default.
pdfsplitpages
PDF Page Rotator
Rotate selected or all PDF pages locally before export.
Built as a free browser-local AppHelp utility with copy or download output and no account requirement.
pdfrotatepages
PDF Delete Pages
Select PDF pages to remove and download a cleaned copy.
Built as a free browser-local AppHelp utility with copy or download output and no account requirement.
pdfdeletepages
PDF Page Reorder
Drag page cards into the right PDF page order.
Built as a free browser-local AppHelp utility with copy or download output and no account requirement.
pdfreorderdrag
PDF Page Numbers
Add page numbers with position, prefix, and size controls.
Built as a free browser-local AppHelp utility with copy or download output and no account requirement.
pdfpage numbersdocument
PDF Watermark
Apply a text watermark with opacity and angle controls.
Built as a free browser-local AppHelp utility with copy or download output and no account requirement.
pdfwatermarkbrand
CSV to Markdown Table
Turn pasted or uploaded CSV into a Markdown table.
Built as a free browser-local AppHelp utility with copy or download output and no account requirement.
csvmarkdowntable
Barcode Generator
Generate barcodes and download SVG or PNG assets.
Built as a free browser-local AppHelp utility with copy or download output and no account requirement.
barcoderetailinventory
UTM Builder
Build, batch-generate, and inspect UTM links with classic and advanced GA4 campaign fields.
Preserve existing queries and fragments, apply naming presets, inspect links, and export up to 100 URLs as CSV locally.
utmmarketingurl
GPX, KML & GeoJSON Viewer
View, merge and convert GPX, KML, GeoJSON and CSV coordinates on a map.
Browser-local map file viewer on OpenStreetMap with KML/GPX/GeoJSON conversion, GPX merge, track joining, CSV to KML and distance stats.
gpxkmlgeojsonmap
Invoice PDF Print Layout
Print 2 or 4 invoice PDFs per A4 page with cut lines, locally.
Browser-local invoice sheet builder with 1/2/4-up layout, auto rotation, margins, cut lines, reorder and preview.
pdfinvoiceprinta4
PDF Sign & Stamp
Sign PDFs, add stamps or text marks and flatten them, no upload.
Browser-local PDF signing with a signature pad, stamp images with white removal, multilingual text marks, drag placement and flatten-to-image.
pdfsignstampsignature
Frequently asked questions
Which AppHelp tools help with data conversion?
The data hub groups timestamp, query string, JSON, CSV, Markdown table, PDF, and small file conversion tools for operational cleanup workflows.
Are data conversion tools account-based?
No account is required for the listed browser-local tools. They are designed for quick conversion and inspection tasks directly from the page.