Callable Labs
Callable Labs builds dependable APIs for machine-readable workflows.
Fill DOCX and HTML/Markdown templates with JSON to produce DOCX, HTML or PDF, or generate invoices, receipts, certificates, letters and reports from JSON alone. Render Mermaid, Graphviz, D2 and Vega-Lite diagrams, LaTeX math and syntax-highlighted source code to SVG, PNG, PDF, JPEG, WebP or a JSON data URI, with structured syntax errors that name the line to fix. Generate styled, scan-checked QR codes and common 1D/2D barcodes; decode every symbol in an uploaded image; and validate GS1 Digital Link, EPC/SEPA, Swiss QR-bill, Pix BR Code, UPI and EMVCo payloads with field-level diagnostics.
Read images and PDF pages into Markdown, text and structured document blocks, or remove photo backgrounds and create subject masks. Recognition and subject detection can make mistakes; review outputs before relying on them.
Our APIs are designed for automation and agent workflows. Files are processed temporarily; files retrieved from URLs may remain for up to 10 minutes and derived results may remain for up to 24 hours. Operational records have separate retention. See each service's Privacy Notice for its handling of submitted content; ApyHub separately handles account, billing and usage information.
Services from Callable Labs
7 liveCreate, Validate & Parse E-Invoice API
Create ZUGFeRD, XRechnung, or Peppol e-invoices, validate XML or PDF documents, and extract invoice data, totals, and rule errors.
Callable LabsRemove Image Background with Advanced Controls API
Remove Image Background with Advanced Controls API removes the background from an image and returns the cut-out subject in the format you request. Send an image by public URL or base64, and choose whether you want JSON metadata, PNG, WebP, or JPEG output. Use crop to trim the result to the subject's bounding box, and padding to keep extra pixels around it when cropping. You can also set quality to best or fast, limit the output with maxsize, and place the subject on a transparent background or a solid #RRGGBB color. JPEG output requires an opaque background, while json returns metadata plus a PNG data URI. The response includes the output format, mediatype, width, height, bytes, datauri, quality, and foregroundratio. It also returns the subject bbox in the original image when one is found, or null when nothing is detected. Use it for product photos, profile images, marketplace listings, and any workflow that needs a clean foreground subject without manual editing.
Callable LabsGenerate Image Foreground Mask API
Generate Image Foreground Mask API lets you isolate a subject from an image and return either a mask or a background-removed image. Send a public image URL or base64-encoded image data, and choose whether you want JSON metadata or image bytes back. Use the subject mask endpoint when you need a grayscale cutout for compositing, edge cleanup, or downstream image analysis. The response includes the output format, media type, width, height, byte size, data URI, subject bounding box, foreground ratio, and the quality setting used. If nothing is found, bbox is null. Use the background-removal endpoint when you need a ready-to-use subject image. You can crop to the subject's bounding box, add padding, limit the output size, and pick best or fast quality. Output can be json, png, webp, or jpeg; JPEG requires an opaque background color in #RRGGBB form. This is a good fit for product photos, profile pictures, asset pipelines, and any workflow that needs transparent backgrounds or a consistent subject crop. Both endpoints accept images up to 20 MB and return a data URI alongside the image metadata, so you can pass results straight into your storage, preview, or rendering pipeline.
Callable LabsImage & PDF OCR to Markdown API
Extract text, tables, and blocks from PDFs or images as Markdown, text, or JSON. Useful for document ingestion, receipts, scans, and screenshots.
Callable LabsDiagram, Math and Code Render API
Render Mermaid, Graphviz, D2 and Vega-Lite diagrams, LaTeX math and highlighted code to PNG, SVG or PDF with one API call. Free tier on ApyHub.
Callable LabsValidate Payment & Generate QR API
Validate GS1 and payment QR payloads, inspect parsed fields, and render scannable QR codes in common formats. Useful for checkout, invoicing, and test automation.
Callable LabsDecode QR & Barcode API
Decode QR codes and barcodes from an image URL or base64 payload. Returns decoded text, format, position, and parsed payloads when available.
Callable Labs