All-in-One Tools Collection
A broad collection of online tools for development, AI, design, and productivity tasks.
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PDF Denoise
Remove visual noise from scanned PDF pages — salt-and-pepper speckle, random grain, and faint background haze — using real image-processing algorithms. Text pages are preserved as searchable vector content.
PDF Deskew
Automatically detect and correct skewed (tilted) PDF pages. Preserves text pages as searchable vector content and only rasterizes image pages (e.g. scans).
PDF Form Data Export
Read AcroForm field names, types and current values from a PDF and export them to JSON
PDF Form Fill Batch
Fill one PDF form template with an array of records and output one filled PDF per record (ZIP) or a merged PDF
PDF Form Flatten
Flatten a PDF form: bake field values into static content so the result is non-editable
PDF Reading Time & Page Stats
Estimate reading time from PDF word counts, page pacing, and section-level breakdowns
Argon2 Password Hash Generator
Generate Argon2id password hashes with tunable memory, iterations, parallelism, salt length, and PHC output
Barbell Plate Load Calculator
Calculate a symmetric per-side plate setup for a target barbell weight, with kg/lb support and custom inventory
PDF Batch Compress
Compress multiple PDF files with image downsampling and optimization, packaged as ZIP
PDF Batch Split
Split multiple PDF files by page ranges or single-page mode, packaged as ZIP
PDF Batch Watermark
Apply text watermarks to multiple PDF files with rotation, opacity, and tiling options
PDF Clean (PDF清理工具)
Remove metadata, annotations, bookmarks, and form fields from PDF files