# SizeMarker

> SizeMarker (https://www.sizemarker.com) is a precise dimension & spec annotation tool. It adds accurate dimensions, spec labels, focus spotlights, callouts, and contour lines to product photos, so buyers see exact sizes and details before they order — cutting pre-sale size questions and size-driven returns for foreign-trade B2B suppliers (furniture, industrial, building materials) and e-commerce sellers.

Key facts:
- Measurements are drawn with deterministic geometry, so marked dimensions stay accurate; AI assists with placement but never guesses numbers — unlike AI image generators, which restyle photos but cannot mark true sizes.
- Scope: buyer-facing spec diagrams, not CAD or engineering drafting.
- Annotation types: dimension, label, focus, marketing callout, contour. Coordinates are normalized (0-1) so annotations survive image resize and zoom.
- Runs in the browser, free to start, no install required; a desktop app is also available.
- Available in 12 languages: en, zh-cn, zh-tw, ja, ko, es, pt, fr, de, th, id, fil.
- Pricing (USD): Free plan $0; Pro $19.90/month or $118.80/year; Enterprise $29.90/seat/month or $178.80/seat/year.

## Core pages
- [Home](https://www.sizemarker.com/): product overview, features, and pricing
- [Pricing](https://www.sizemarker.com/pricing): Free, Pro, and Enterprise plans with prices and what each plan includes
- [Site map](https://www.sizemarker.com/sitemap): full index of tools, comparisons, guides and the dimension reference library
- [Return cost calculator](https://www.sizemarker.com/tools/return-calculator): free tool to estimate what product returns cost per order and per month
- [Spec sheet scenario](https://www.sizemarker.com/scenarios/spec-sheet): how suppliers turn product photos into buyer-ready spec diagrams
- [Furniture spec diagram maker](https://www.sizemarker.com/scenarios/furniture-spec-diagram): mark furniture width, depth, height, packed size, materials and weight capacity from a photo to prevent size returns
- [Industrial spec diagram maker](https://www.sizemarker.com/scenarios/industrial-spec-diagram): mark equipment dimensions, port positions and technical specs B2B buyers can quote from, no CAD required
- [Building material spec diagram maker](https://www.sizemarker.com/scenarios/building-material-spec-diagram): mark tile, panel and profile size, thickness and coverage from a photo
- [Best tools to add dimensions to product photos](https://www.sizemarker.com/best-tools-to-add-dimensions-to-product-photos): honest comparison of SizeMarker vs Canva, Photoshop, Photopea, Figma, Snagit and Google Drawings for marking dimensions and specs on product photos
- [Best spec sheet software for exporters](https://www.sizemarker.com/best-spec-sheet-software-for-exporters): 7 tools compared for building export spec sheets — Excel/Word for the data table, SizeMarker for dimension-accurate spec diagrams, plus Canva, Photopea, Affinity, Visme and Specright
- [SizeMarker vs Canva](https://www.sizemarker.com/sizemarker-vs-canva): side-by-side comparison for adding accurate dimensions and specs to product photos
- [SizeMarker vs Photoshop](https://www.sizemarker.com/sizemarker-vs-photoshop): side-by-side comparison for adding accurate dimensions and specs to product photos
- [SizeMarker vs AI image generators](https://www.sizemarker.com/sizemarker-vs-ai-image-generators): why generative AI image tools cannot mark accurate dimensions, and when to use each
- [Ecommerce returns & size statistics](https://www.sizemarker.com/ecommerce-returns-size-statistics): 30 sourced statistics on return rates, size/fit as the top return reason, and how images and specs affect buying
- [Standard product dimensions reference](https://www.sizemarker.com/dimensions): sourced standard-size charts (furniture, logistics, building materials) in metric and imperial, from ISO/ANSI/EN and established industry standards
- [Standard sofa dimensions](https://www.sizemarker.com/dimensions/standard-sofa-dimensions): standard sofa sizes by type (loveseat, 3-seat, 4-seat, sectional) in cm and inches
- [Standard dining table dimensions](https://www.sizemarker.com/dimensions/standard-dining-table-dimensions): dining table size by number of seats, plus standard height and clearance
- [Standard mattress sizes](https://www.sizemarker.com/dimensions/standard-mattress-sizes): US, UK and EU bed sizes in inches and centimetres, and why the same name differs by region
- [Standard pallet sizes](https://www.sizemarker.com/dimensions/standard-pallet-sizes): ISO 6780 and regional pallet dimensions (GMA 48x40, Euro EPAL 1200x800, Asian, Australian)
- [Shipping container dimensions](https://www.sizemarker.com/dimensions/shipping-container-dimensions): ISO 668 external and internal size, volume and payload for 20ft, 40ft and High Cube
- [Standard door sizes](https://www.sizemarker.com/dimensions/standard-door-sizes): US and UK/EU interior and exterior door dimensions and thickness
- [Standard desk dimensions](https://www.sizemarker.com/dimensions/standard-desk-dimensions): desk height, width and depth by type, plus ANSI/BIFMA sit-stand ranges and OSHA legroom
- [Standard bookshelf dimensions](https://www.sizemarker.com/dimensions/standard-bookshelf-dimensions): bookcase width, depth, height and shelf spacing (IKEA Billy + library shelving)
- [Standard wardrobe dimensions](https://www.sizemarker.com/dimensions/standard-wardrobe-dimensions): single/double/triple widths, hanging depth and long-hang vs double-hang rail heights (IKEA PAX)
- [Standard office chair dimensions](https://www.sizemarker.com/dimensions/standard-office-chair-dimensions): BIFMA G1 seat, backrest and armrest adjustment ranges in cm and inches
- [Standard coffee table dimensions](https://www.sizemarker.com/dimensions/standard-coffee-table-dimensions): height, size by shape and the two-thirds-of-sofa pairing rule
- [Standard steel drum dimensions](https://www.sizemarker.com/dimensions/standard-steel-drum-dimensions): 55-gallon / 200L drum diameter and height, plus 30 and 16-gal, per ISO 15750
- [Standard IBC tote dimensions](https://www.sizemarker.com/dimensions/standard-ibc-tote-dimensions): 1000L / 275-gallon caged tote footprint and height from Schutz and Mauser datasheets
- [Standard corrugated box sizes](https://www.sizemarker.com/dimensions/standard-carton-box-sizes): FEFCO 0201 RSC box styles, A-F flute grades, and USPS/Amazon FBA box size limits
- [Standard tile sizes](https://www.sizemarker.com/dimensions/standard-tile-sizes): ceramic and porcelain formats, thickness by use and nominal vs actual sizing (ISO 13006)
- [Standard plywood sheet sizes](https://www.sizemarker.com/dimensions/standard-plywood-sheet-sizes): 4x8 ft and metric panels, thickness nominal vs actual (a 3/4-in sheet is 23/32 in), per APA
- [Dimensional lumber sizes](https://www.sizemarker.com/dimensions/dimensional-lumber-sizes): nominal vs actual softwood sizes (a 2x4 is 1.5 x 3.5 in / 38 x 89 mm) per US PS 20
- [Standard brick dimensions](https://www.sizemarker.com/dimensions/standard-brick-dimensions): US, UK/EU, China and India brick sizes, and the nominal vs specified/actual distinction
- [Standard stair dimensions](https://www.sizemarker.com/dimensions/standard-stair-dimensions): rise, run/going, width and headroom limits by US IRC and UK Approved Document K
- [Standard countertop dimensions](https://www.sizemarker.com/dimensions/standard-countertop-dimensions): counter height, depth, slab thickness, backsplash and quartz slab sizes (NKBA)
- [Standard bed frame dimensions](https://www.sizemarker.com/dimensions/standard-bed-frame-dimensions): US Twin–Cal King, UK & IKEA EU bed sizes, frame-vs-mattress margin, headboard heights
- [Standard TV stand dimensions](https://www.sizemarker.com/dimensions/standard-tv-stand-dimensions): match stand width to TV size, media console depth 13.75–18.5 in, 42 in seated eye-level
- [Standard nightstand dimensions](https://www.sizemarker.com/dimensions/standard-nightstand-dimensions): 18–30 in wide, 12–30 in deep, 23–29 in tall matched to the mattress top
- [Standard export wooden crate dimensions](https://www.sizemarker.com/dimensions/standard-wooden-crate-dimensions): weight classes, ASTM D6039 4,000 lb limit, ISPM-15 marking, pallet-matched bases
- [Standard bulk bag (FIBC) dimensions](https://www.sizemarker.com/dimensions/standard-bulk-bag-dimensions): 35×35–42×42 in bases, SWL 5:1/6:1 safety factor, ISO 21898, U-panel/circular/baffle types
- [Standard gaylord box dimensions](https://www.sizemarker.com/dimensions/standard-gaylord-box-dimensions): 48×40 in GMA-pallet footprint, wall count vs capacity (500–2,500+ lb)
- [Standard window sizes](https://www.sizemarker.com/dimensions/standard-window-sizes): US size codes (2846, 3050), casement & sliding, UK/EU metric, nominal vs rough opening
- [Standard drywall sheet sizes](https://www.sizemarker.com/dimensions/standard-drywall-sheet-sizes): 4×8/4×10/4×12 ft, thickness 1/4–5/8 in, EN 520 metric, panel weights (ASTM C1396)
- [Standard dresser dimensions](https://www.sizemarker.com/dimensions/standard-dresser-dimensions): horizontal 50–70 in, tallboy 24–40 in wide × 40–60 in tall, 18–24 in deep, plus dresser-vs-TV width rule
- [Standard dining chair dimensions](https://www.sizemarker.com/dimensions/standard-dining-chair-dimensions): seat 18 in high, 16–20 in wide, 15–18 in deep, 10–12 in table clearance, 24–26 in per person
- [Standard bar stool dimensions](https://www.sizemarker.com/dimensions/standard-bar-stool-dimensions): counter-height 24–26 in vs bar-height 28–32 in seats, 10–12 in clearance, stool spacing
- [Standard kitchen cabinet dimensions](https://www.sizemarker.com/dimensions/standard-kitchen-cabinet-dimensions): base 34.5 in tall / 24 in deep, wall 12–42 in, pantry 84–96 in, 3-in width increments, IKEA SEKTION metric
- [Standard bathroom vanity dimensions](https://www.sizemarker.com/dimensions/standard-bathroom-vanity-dimensions): 32 in standard vs 34–36 in comfort height, 21 in depth, 24–72 in single/double widths
- [Standard crib dimensions](https://www.sizemarker.com/dimensions/standard-crib-dimensions): US full-size interior 28 × 52 3/8 in (16 CFR 1219), mattress ≥27 1/4 × 51 5/8 in, 2 3/8 in slat gap, EU EN 716 cots
- [Standard TV sizes](https://www.sizemarker.com/dimensions/standard-tv-sizes): 16:9 screen width & height for 32–85 in (55 in = 47.9 × 27.0 in), plus VESA mount patterns
- [Standard semi-truck trailer dimensions](https://www.sizemarker.com/dimensions/standard-truck-trailer-dimensions): 53/48/40 ft dry-van interior L×W×H, pallet count, US legal maxima, EU 13.6 m tautliner
- [Standard ISO tank container dimensions](https://www.sizemarker.com/dimensions/standard-iso-tank-container-dimensions): T11 20 ft frame 6058 × 2438 × 2591 mm, 21,000–26,000 L, tare, 36,000 kg max gross (ISO 668/1496-3)
- [Standard jerry can dimensions](https://www.sizemarker.com/dimensions/standard-jerry-can-dimensions): 5–25 L UN HDPE jerricans (20 L ≈ 292 × 246 × 389 mm), NATO steel 20 L can, UN markings
- [Standard wine bottle dimensions](https://www.sizemarker.com/dimensions/standard-wine-bottle-dimensions): 750 ml Bordeaux/Burgundy/Champagne height & diameter, 375 ml half, 1.5 L magnum, glass weight
- [Standard bucket & pail dimensions](https://www.sizemarker.com/dimensions/standard-bucket-pail-dimensions): 5-gallon pail 11.9 in top OD × 14.5 in tall, 1–3.5 gal sizes, HDPE wall, 240/pallet
- [Standard poly mailer sizes](https://www.sizemarker.com/dimensions/standard-poly-mailer-sizes): 6×9 to 19×24 in flat mailers, 2–2.5 mil wall, bubble mailer #000–#7, what fits each
- [Standard shipping label sizes](https://www.sizemarker.com/dimensions/standard-shipping-label-sizes): 4×6 in thermal label all carriers accept (USPS/UPS/FedEx/DHL), plus A6 and barcode sizes
- [Standard rebar sizes](https://www.sizemarker.com/dimensions/standard-rebar-sizes): US #3–#18 diameter/area/weight (ASTM A615), Canadian 10M–35M (CSA G30.18), European Ø8–Ø32 (EN 10080)
- [Standard steel I-beam sizes](https://www.sizemarker.com/dimensions/standard-steel-i-beam-sizes): AISC W-shapes (W12×26 = 12.2 in deep), American S-beams, European IPE/HEA/HEB (EN 10365)
- [Standard PVC pipe sizes](https://www.sizemarker.com/dimensions/standard-pvc-pipe-sizes): Schedule 40 & 80 OD/wall/ID for 1/2–6 in NPS (ASTM D1785), metric PVC-U Ø20–110 mm PN classes
- [Standard toilet dimensions](https://www.sizemarker.com/dimensions/standard-toilet-dimensions): 12 in rough-in, elongated 29–31 in vs round 27–28 in, 15 in standard vs 17–19 in ADA seat height, IPC/ADA clearances
- [Standard kitchen sink sizes](https://www.sizemarker.com/dimensions/standard-kitchen-sink-sizes): single 30–33 in, double 33/36 in, ~22 in front-to-back, 8–10 in deep, base-cabinet rule
- [Standard CMU block dimensions](https://www.sizemarker.com/dimensions/standard-cmu-block-dimensions): nominal 8×8×16 in = actual 7 5/8 × 7 5/8 × 15 5/8 in (ASTM C90), 4–12 in widths, metric 190×190×390 mm
- [Standard glass thickness](https://www.sizemarker.com/dimensions/standard-glass-thickness): float glass 2–19 mm (EN 572-2/ASTM C1036), ~2.5 kg/m² per mm, jumbo 3210 × 6000 mm sheets
- [Standard garage door sizes](https://www.sizemarker.com/dimensions/standard-garage-door-sizes): single 8–10 × 7 ft, double 16–18 × 7 ft, 7 & 8 ft heights, RV/oversized, UK metric (ANSI/DASMA 102)
- [Showcase](https://www.sizemarker.com/showcase): real before/after annotation cases with results
- [Blog](https://www.sizemarker.com/blog): guides on spec diagrams, dimension labeling, returns reduction, and platform image rules

## Showcase cases
- [Everything a Sofa Buyer Needs, on One Listing Image](https://www.sizemarker.com/showcase/furniture-listing-annotation-demo): A velvet sofa as a complete listing image: 148×88×82 cm dimensions, feature callouts and a shipping badge — so buyers see every spec before they message you.
- [A Bar Stool Buyers Can Measure Before They Order](https://www.sizemarker.com/showcase/amazon-bar-stool-size-labels-reduce-returns): A wooden bar stool listing image marked with a 40 × 40 cm seat, 70 cm seat height and a 30 cm footrest — so buyers check counter fit before they order.
- [Bag Dimensions and Material, at a Glance](https://www.sizemarker.com/showcase/scenario-bag-size): A green leather handbag as a spec image: 30 × 22 × 14 cm, with full-grain leather and gold-tone hardware labels, so size and material are answered up front.
- [Package Box Dimensions, Marked at a Glance](https://www.sizemarker.com/showcase/dimension-white-box-demo): A plain white product box marked with 24 cm height, 12 cm width and 8 cm depth on the carton itself, so buyers read the exact package size before they order.
- [Amazon Lounge Chair Labels Cut Returns 60%](https://www.sizemarker.com/showcase/amazon-lounge-chair-size-labels-cut-returns): For this Amazon lounge chair listing, we used SizeMarker to add comprehensive size markers covering overall width, seat depth, back height, and footrest extension length, plus feature labels and a clean outline curve.

Key annotations added:
- Overall dimensions (width x depth x height) for space planning
- Seat depth and back height for comfort assessment
- Footrest extension length for reclining chairs
- Feature callouts: material, weight capacity, mechanism
- Contour outline separating product from background

Result: Conversion rate increased by 35% and returns dropped by 60%, primarily eliminating size-mismatch complaints. The combination of precise measurements and feature labels turned the image into a complete decision-making tool.
- [Amazon Wall Cabinet Size Labels Cut Refunds](https://www.sizemarker.com/showcase/amazon-wall-cabinet-size-labels-cut-refunds): For this solid wood wall cabinet listing on Amazon, we used SizeMarker to add precise width, height, and depth dimension lines directly on the product images.

Key annotations added:
- External dimensions (width x height x depth)
- Internal shelf spacing for storage planning
- Clean minimal annotation style matching the product aesthetic

Result: Shoppers could instantly verify if the cabinet fits their wall space, leading to more confident purchases. Size-related refunds dropped to near zero, and customer service inquiries about dimensions decreased dramatically.

## Recent blog posts
- [Product Dimensions Structured Data: Fields Nobody Fills In](https://www.sizemarker.com/blog/product-dimensions-structured-data): Product dimensions structured data in schema.org, Google Merchant Center and the ChatGPT feed: every field, copy-paste JSON-LD, and the rule that breaks it.
- [Custom-Made Goods Return Rights: The Exemption You Can Lose](https://www.sizemarker.com/blog/custom-made-goods-return-rights): Custom-made goods return rights: the EU and UK 14-day withdrawal carve-out, the two conditions it turns on, and the disclosure slip that costs 12 months.
- [Perspective Distortion in Product Photos: It's Not the Lens](https://www.sizemarker.com/blog/perspective-distortion-product-photos): Perspective distortion in product photos comes from camera distance, not focal length. The arithmetic, a distance table, and why no lens adds scale.
- [Digital Product Passport: What Ships When, 2026-2029](https://www.sizemarker.com/blog/digital-product-passport-timeline): Digital Product Passport timeline by product group: battery passport 18 Feb 2027, steel 2026, textiles 2027, furniture 2028, plus the 18-24 month rule.
- [WLL vs MBL: 6 Labels That Get Slings Rejected](https://www.sizemarker.com/blog/wll-vs-mbl-load-rating-labels): WLL vs MBL differ by a design factor of 2:1 to 7:1, so the wrong label overstates capacity by a multiple. Six rejected patterns and what to write instead.
- [mAh to Wh: The Number Your Airline Reads Is Not on the Box](https://www.sizemarker.com/blog/mah-to-wh-battery-shipping-limits): mAh to Wh conversion decides whether a battery flies. The 100 Wh and 160 Wh thresholds, PI 965/966/967, the 30% state-of-charge rule, and the voltage mistake.
- [NPT vs BSP Thread: They Screw Together, Then They Leak](https://www.sizemarker.com/blog/npt-vs-bsp-thread-identification): NPT vs BSP thread runs 14 TPI in both at 1/2 in, so it assembles and then leaks. TPI and major-diameter tables, plus an eight-field callout template.
- [EI30 vs FD30: Four Markets, Four Fire Door Ratings](https://www.sizemarker.com/blog/ei30-vs-fd30-fire-door-ratings): EI30 vs FD30 is not the same rating: EI covers integrity and insulation, FD covers integrity only. Four export markets, four systems, one decision tree.
- [Aluminium Extrusion Slot Width: Why 2020 Is Not a Spec](https://www.sizemarker.com/blog/aluminium-extrusion-slot-width): Aluminium extrusion slot width is the number 2020 never tells you. Five ordering mistakes, the kg/m test, and the eight-field spec block that ends them.
- [Mesh Count vs Micron: Same 100 Mesh, 51 Microns Apart](https://www.sizemarker.com/blog/mesh-count-vs-micron-opening): Mesh count vs micron: mesh is a weave density, not an aperture. Two 100-mesh cloths can differ by 51 microns and both be honestly labelled.
- [Drawer Slide Clearance: Lock 4 Numbers Before You Cut](https://www.sizemarker.com/blog/drawer-slide-clearance-sizing): Drawer slide clearance is 12.7 mm per side for side-mount and a material-dependent deduction for undermount. Here is the order to lock the numbers in.
- [Cabinet Hinge Boring Dimensions: Five Numbers, Not One](https://www.sizemarker.com/blog/cabinet-hinge-boring-dimensions): Cabinet hinge boring dimensions are five numbers, not one: 35 mm cup, 13 mm depth, drilling distance, fixing pattern and cup position along the door.
- [STC vs Rw: Why Your 45 dB Window Gets Graded at 39](https://www.sizemarker.com/blog/stc-vs-rw-sound-rating): STC vs Rw sound ratings differ by 1-2 points, but Rw+Ctr can cut 6 dB. What each index measures, which market grades on which, and how to write the acoustic line.
- [Full Overlay vs Half Overlay: Two Answers, 9.5 mm Apart](https://www.sizemarker.com/blog/full-overlay-vs-half-overlay-cabinet-doors): Full overlay vs half overlay means different geometry on face-frame and frameless cabinets: the door-size math, the reveal, and what to ask before cutting.
- [Shore A vs Shore D: Why 'Shore 70' Is Not a Spec](https://www.sizemarker.com/blog/shore-a-vs-shore-d-hardness): Shore A vs Shore D hardness are two instruments, not two precisions: why 'Shore 70' is not a spec, why no conversion exists, and how to write a callout that holds.

For the complete article list, see https://www.sizemarker.com/llms-full.txt

## Legal
- [Terms of Service](https://www.sizemarker.com/service/terms)
- [Privacy Policy](https://www.sizemarker.com/service/privacy)