All-in-One "Offline-First" toolkit, Nothing leaves your machine.
FVP is a complete workspace for developers: format, validate, compare, convert, and analyze JSON, YAML, CSV, logs, and more. Everything runs locally in your browser—no uploads, no tracking, no server required. Press Ctrl+K to jump to any tool.
Messy data, made readable
Many tools. One workspace. Zero uploads.
Why choose FVP
What makes FVP different?
The essentials — how FVP compares at a glance.
|
Feature
What we compare
|
FVP
Offline-first
Private · local · no uploads
|
Online tools
Browser + upload
|
Other offline
Install · single-purpose
|
|---|---|---|---|
Works offline (file://) |
Fully | No | Varies |
| No data upload | Never | Always | Never |
| Large files (up to 1 GB) | Yes | Limited | Rare |
| All-in-one workspace | 18 tools | Usually 1–2 | Usually 1 |
| On-device PII & Secrets | Rules + ML | Upload required | Rare |
| Log trace analysis | Built in | Separate tools | Rare |
| Transform Pipeline | Chained steps | Separate tools | Rare |
| Infra tooling | Compose, Helm, SQL | Separate tools | Rare |
| Diagram workspace | Mermaid, graphs, canvas | Separate tools | Rare |
| Paste or file input | Most tools | Text only | File only |
| Session auto-save | 7-day expiry | Manual | None |
| No install needed | Browser only | Browser | Install |
What you can do
Make sense of data files, configs, and logs.
Whether you're reviewing API responses, checking deployment files, or cleaning up documentation, FVP gives you the tools to work faster.
Turn unreadable files into something you can actually review
Paste JSON from an API, a config file, or export—and see it formatted, indented, and color-coded instantly.
Compare two versions and see exactly what's different
Before deploying a config or merging changes, compare files side-by-side to catch additions, deletions, and modifications.
Preview CSV and TSV exports without uploading to the cloud
Open spreadsheet exports, filter columns, validate structure, and convert to JSON or XML—all locally in your browser.
Preview Markdown and visualize flows without leaving your workspace
Write documentation or sketch system diagrams with live preview—export to HTML, PNG, or SVG when ready.
Find personal data and secrets before sharing files
Scan text for emails, phone numbers, API keys, and passwords—so you can remove them before posting to Slack or GitHub.
Validate Docker Compose, SQL schemas, and deployment files
Check syntax, visualize service relationships, and convert between formats—catch errors before they reach production.
Stop hunting through log files—see the entire request journey in one view
Paste logs from multiple services and watch FVP automatically connect the dots. See which service slowed down, where errors happened, and how long each step took—all in a visual timeline.
Encode, hash, and encrypt text in a step-by-step pipeline
Stack Base64, hex, URL encoding, SHA hashes, AES encryption, and JWT decode in one vertical flow—each step shows live output, fully offline.
Design systems and flows on an infinite canvas—no cloud account required
Drop engineer-ready shapes—databases, queues, APIs, servers, and more—onto a freeform canvas. Draw flowcharts, wireframes, and system designs fully offline, then export to PNG or SVG.
For developers
A technical toolkit with specialized format viewers.
Deep-dive into every format with validation, conversion, schema support, and advanced features.
Structured Data
JSON
Format, minify, validate, compare, tree view, JSONPath queries, and schema validation.
YAML
Parse and format YAML files with syntax validation and error reporting.
CSV / TSV
Preview tabular data with column filtering, delimiter detection, and JSON/XML export.
XML
Format and validate XML documents with proper indentation and error detection.
Universal Conversion
Convert between JSON, YAML, and XML formats seamlessly.
Smart Diagram
Visualize JSON, YAML, and XML as interactive node graphs with search, collapse, and export.
Encoding & Tokens
Transform Pipeline
Chain encode, decode, hash, and encrypt steps—Base64, hex, SHA-256, AES-256-GCM, PBKDF2, JWT decode, and more.
Base64
Encode and decode Base64, URL-safe Base64, and Data URLs.
JWT
Decode, validate, and analyze JSON Web Tokens with detailed claims inspection.
Docs & Diagrams
Markdown
Live preview with GitHub Flavored Markdown, code highlighting, and HTML export.
Mermaid
Render flowcharts, sequence diagrams, ERDs, Gantt charts, and more from text.
Atlas Whiteboard
Infinite freeform canvas with engineer shapes (DB, queue, API, server, cloud) for system diagrams, flowcharts, and wireframes. Export to PNG or SVG.
Advanced Tools
Protobuf
Decode and encode Protocol Buffers with schema validation and message inspection.
Log Tracer
Parse distributed traces from logs, visualize timelines, and analyze spans across services.
Docker Compose
Validate compose files, visualize service dependencies, and convert to Helm charts.
Helm Templates
Render Go-style templates with JSON or YAML values offline—ideal for Kubernetes manifests and Helm charts.
SQL Schema
Convert between SQL dialects and generate interactive ER diagrams from DDL.
PII & Secrets
Detect personal information and secrets with pattern matching and on-device AI.
On-device intelligence
Spot sensitive data with local AI—nothing leaves your machine.
FVP's PII & Secrets tool pairs fast pattern checks with an optional on-device model for trickier English, Arabic, and mixed text. Inference runs locally—no API keys and no uploads.
- Instant rules Emails, tokens, keys, and common secret patterns
- Private by design Scanning does not send your content to external services
Support This Project
Help keep FVP free to use
FVP is developed and maintained by Mohamed Sweelam. Your support helps cover development costs and keeps core features free.
FVP is and will always be free. Donations are entirely optional.