Data Tools Guides
8 GUIDESHow to move data between the formats that refuse to talk to each other — spreadsheet exports, API payloads, and subtitle files that a player won’t accept.
How to Convert a JSON API Response to CSV Without Uploading It
Turn a JSON API response into a CSV spreadsheet entirely in your browser — no upload, no account, and the file opens cleanly in Excel or Google Sheets.
Read the guide →Convert CSV to JSON Offline in Your Browser
Parse a CSV into a typed JSON array without the file leaving your computer. Works entirely in the page — no sign-up, no server, no data sharing.
Read the guide →Decode Base64 Locally Without Sending It to a Server
Inspect JWT segments, config values, and encoded files by decoding base64 right in the page — your input never travels over the network.
Read the guide →Convert CSV to Excel Without Losing Leading Zeros
Stop Excel from stripping zeros off ZIP codes and rewriting long IDs. Convert CSV to .xlsx locally in your browser, with risky values kept as text.
Read the guide →Export Excel to UTF-8 CSV for CRM Imports
Get a clean UTF-8 CSV out of an .xlsx workbook so accented names survive a CRM or mailing-list import. Converted locally — the file is never uploaded.
Read the guide →Turn a Spreadsheet Into JSON Without Uploading It
Convert an Excel sheet into a pretty-printed JSON array — header row as keys — using only your browser. Nothing reaches a server; free with no sign-up.
Read the guide →Find the Exact Error in Invalid JSON
Locate the trailing comma, stray quote, or bad character breaking your JSON. The validator points at the exact position and parses everything locally.
Read the guide →Fix SRT Subtitles That Won’t Load in HTML5 Video
Captions showing nothing in your web player? Convert .srt to WebVTT with the header and timestamps corrected — batch files, all in your browser.
Read the guide →