FreeMerge PDF
Combine files in seconds
Drop any number of PDFs, reorder pages visually and download one clean document.
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Demo & free tools
Free and pro Zehnax tools: merge, compress, OCR, split, redact and batch workflows, plus the Zehnax notepad, Unity CAD Studio, a scientific calculator and a graphing calculator — each with its own page.
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FreeCompress PDF
Shrink scans, keep quality
Reduce huge scans to email-friendly sizes with visually lossless presets.
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FreeOCR Scanner
Make scans searchable
Turn scanned paper into searchable, selectable text in 40+ languages.
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FreeSplit PDF
Extract exactly what you need
Slice by page, range, bookmark or file size — preview before you export.
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ProRedact PDF
Delete content for real
Permanently remove text, images and metadata — not just black boxes.
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ProBatch Workflows
One click, a whole folder
Chain tools into a saved preset and run it across hundreds of files.
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FreeZehnax MathPad
Notes that do the math
A Markdown notepad with dynamic math blocks, function graphs and value tables.
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FreeUnity CAD Studio
3D & 2D modeling in the browser
A full-screen CAD studio for 3D and 2D modeling, powered by Unity WebGL.
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FreeScientific Calculator
Full precision, five modes
Trig, hyperbolic and combinatorics, plus matrix, vector, equation and base-conversion tabs.
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FreeGraphing Calculator
Plot in 2D and 3D
Functions, polar, parametric and 3D surfaces, with value tables, statistics and regression.
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